Stoichiometric balance of a combustion reaction. A stoichiometric balance of a combustion reaction must demonstrate conservation of mass, but not conservation of moles because stoichiometry of a chemical reaction is based on the number of atoms and molecules, but not their masses or volumes.
Conservation of mass is a fundamental principle of physics and chemistry which says that in a closed system, mass cannot be created or destroyed, but only transformed from one form to another. In other words, the total mass of the reactants must be equal to the total mass of the products in a chemical reaction, regardless of the masses or volumes of the individual molecules involved.
On the other hand, conservation of moles refers to the fact that in a balanced chemical equation, the number of moles of each reactant and product is equal. However, since different molecules have different masses, conservation of moles does not necessarily imply conservation of mass.
For example, if one mole of oxygen reacts with one mole of hydrogen to form one mole of water, the number of moles of each substance is conserved, but the mass is not, since the mass of water is greater than the combined mass of oxygen and hydrogen.
The stoichiometric balance of a combustion reaction must demonstrate conservation of mass because the reactants and products involved in combustion reactions are typically gases or liquids that can be easily measured by volume or weight.
Since the number of atoms and molecules involved in the reaction is fixed by the stoichiometry of the equation, the conservation of mass principle ensures that the mass of the reactants is equal to the mass of the products, even if the masses or volumes of individual molecules differ.
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write the balanced chemical equation for the gas-phase production of ammonia from elemental nitrogen and hydrogen
The balanced chemical equation for the gas-phase production of ammonia from elemental nitrogen and hydrogen is:
N2 + 3H2 → 2NH3
This equation represents the reaction of nitrogen molecules, N2, with hydrogen molecules, H2, to form ammonia molecules, NH3. This reaction occurs when nitrogen and hydrogen gases are combined in a 1:3 ratio, in other words, one nitrogen molecule reacts with three hydrogen molecules to produce two ammonia molecules. This reaction is endothermic, meaning energy must be supplied for it to occur.
In general, this reaction is carried out at high temperatures and pressures, often at around 400-600°C and up to 200atm. A catalyst is usually also used, usually iron, to speed up the reaction. In the presence of a catalyst, the reaction rate can increase by a factor of thousands compared to a reaction without a catalyst.
Overall, the balanced chemical equation for the gas-phase production of ammonia from elemental nitrogen and hydrogen is:
N2 + 3H2 → 2NH3
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explain why the intramolecular product is the major product and explain the regioselectivity of the product.
Intramolecular products are preferred over intermolecular products in certain reactions because they are usually more stable and have lower activation energy.
The following are the main reasons why the intramolecular product is the major product:
The intramolecular reaction has a lower activation energy than the intermolecular reaction. As a result, the reaction is more exothermic and occurs more rapidly. The entropy of the system decreases when the intramolecular product is formed, which is energetically favorable. The intramolecular product may be more stable due to hydrogen bonding or a favorable conformational change in the molecule.Regioselectivity is a term used to describe a reaction's ability to form a specific constitutional isomer. In other words, it refers to the preference of a reaction for certain regions of the same compound. Regioselectivity is typically determined by the reaction's mechanism and the steric or electronic effects of the reactants.
In a reaction where a molecule undergoes multiple changes, for example, intramolecular reactions, regioselectivity refers to the selectivity of one or more of these changes.
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question every atom in the universe emits energy in the form of a nucleus. responses true true false
The given statement "every atom in the universe emits energy in the form of a nucleus" is False.
In the universe, every atom does not emit energy in the form of a nucleus. It is not true in the case of every atom in the universe. But it is true that every atom in the universe emits energy.
According to the Bohr model of the atom, an electron orbiting an atomic nucleus emits radiation when it changes its energy level. The radiation emitted by the electron is in the form of a photon of electromagnetic energy. This is a spontaneous process and it is called spontaneous emission. It can be said that every atom in the universe emits energy.
Therefore, it is false that every atom in the universe emits energy in the form of a nucleus.
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how many glyceraldehyde 3-phosphate (g3p) molecules would be produced by 18 turns of the calvin cycle?
Eighteen turns of the Calvin cycle would produce 36 G3P molecules.
The Calvin cycle, also known as the dark cycle, is a metabolic process that occurs in plants and algae. The cycle is made up of a series of chemical reactions that convert carbon dioxide into glucose.
Glyceraldehyde 3-phosphate (G3P) is a three-carbon sugar that is one of the products of the Calvin cycle. Six CO2 molecules and six ribulose-1,5-bisphosphate molecules enter the cycle to create twelve 3-phosphoglycerate molecules.
Twelve ATP molecules and twelve NADPH molecules are then used to transform the 3-phosphoglycerate molecules into twelve G3P molecules. Ten out of twelve G3P molecules are used to regenerate six ribulose-1,5-bisphosphate molecules, while two are used to create glucose or other organic compounds.
Each turn of the Calvin cycle produces one G3P molecule, while each glucose molecule requires two G3P molecules. This implies that 36 G3P molecules would be produced by 18 turns of the Calvin cycle.
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what is the concentration of the naoh solution which requires 37.96 ml of naoh to titrate 0.702 g of khp?
The concentration of NaOH solution that requires 37.96 mL of NaOH to titrate 0.702 g of KHP is 0.0896 M.
To calculate the concentration of the NaOH solution which requires 37.96 mL of NaOH to titrate 0.702 g of KHP, we first need to know the balanced equation of the reaction between NaOH and KHP.
The balanced equation is as follows:
NaOH(aq) + KHC₈H₄O₄(aq) = KNaC₈H₄O₄(aq) + H₂O(l)
According to the equation, one mole of NaOH reacts with one mole of KHP (potassium hydrogen phthalate) to produce one mole of NaKC₈H₄O₄ (sodium hydrogen phthalate) and one mole of H2O (water).
Thus, the mole of NaOH required to titrate KHP is:
Mole of NaOH = (mass of KHP) / (molar mass of KHP)
Molar mass of KHP = 204.22 g/mol (mass of KHP is given as 0.702 g)
Mole of NaOH = 0.702 g / 204.22 g/mol = 0.0034 mol NaOH
The volume of NaOH is also given as 37.96 mL. But we need to convert it to liter.
Liters of NaOH = 37.96 mL / 1000 mL/L = 0.03796 L
Concentration (M) of NaOH can be calculated by dividing the number of moles of NaOH by the volume of NaOH in
.
Concentration (M) of NaOH = 0.0034 mol NaOH / 0.03796 L
NaOH = 0.0896 M
Therefore, the concentration of NaOH solution that requires 37.96 mL of NaOH to titrate 0.702 g of KHP is 0.0896 M.
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the unstable species that exists at the maximum of each energy curve, as reactants are converted to intermediates and products, is called the and the energy required to form this species from the reactants is called the energy for the reaction.
The unstable species that exists at the maximum of each energy curve, as reactants are converted to intermediates and products, is called the transition state, and the energy required to form this species from the reactants is called the activation energy for the reaction.
The transition state of a reaction is an unstable species that represents the highest energy point on the energy profile of a reaction. It is the point at which the reactants are partially converted to products and the energy has not yet been released. This unstable species is only present for a very short time and is often referred to as the “rate-determining step” as its stability dictates how quickly the reaction can take place.
The activation energy of a reaction is the minimum energy required for the reaction to take place. It is the energy required to reach the transition state and is the sum of the energies of the reactants and the energy barrier of the reaction.
In conclusion, the transition state of a reaction is the unstable species that exists at the maximum of each energy curve, as reactants are converted to intermediates and products, and the activation energy of a reaction is the energy required to reach the transition state and initiate the reaction.
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dentify which compounds will be UV active. A UV active compound will fluoresce when exposed to a UV lamp. Upon irradiation with UV light, a UV active compound will absorb the energy and promote an electron from the HOMO to the LUMO. Consider which wavelengths are part of the UV range. The UV active compounds are: CH2=CH2 CH2=CH-CH=CH-CH=CH, CH2=CH-CH=CH-CH=CH-CH=CH, CH2=CH-CH2-CH=CH, CH, =CH-CH=CH
UV active compounds are those that fluoresce when exposed to a UV lamp. Upon exposure to UV light, these compounds absorb energy and promote an electron from the HOMO to the LUMO. Consider which wavelengths are included in the UV range. CH2=CH2, CH2=CH-CH=CH-CH=CH, CH2=CH-CH=CH-CH=CH-CH=CH, CH2=CH-CH2-
CH=CH, and CH, =CH-CH=CH are all examples of UV active compounds.
The UV active compounds in the given list are CH2=CH-CH=CH-CH=CH, CH2=CH-CH=CH-CH=CH-CH=CH, and CH2=CH-CH2-CH=CH. These compounds will **fluoresce** when exposed to a **UV lamp** and absorb energy to promote an electron from the HOMO to the LUMO.
To determine if a compound is UV active, consider the presence of **chromophores** within the molecule. Chromophores are functional groups that absorb UV light, typically containing conjugated double bonds or aromatic rings. In this case, the first three compounds have conjugated double bonds, making them UV active. The fourth compound, CH=CH-CH=CH, lacks sufficient conjugation to be UV active.
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why can we assume that the thiocyanate ion concentration equals the complex ion concentration in beakers 2-7?
The thiocyanate ion (SCN-) concentration equals the complex ion concentration in beakers 2-7 because the reaction that took place was a 1:1 stoichiometric reaction. This means that the moles of SCN- reactant is equal to the moles of complex product formed.
The thiocyanate ion concentration in beakers 2-7 can be assumed to equal the complex ion concentration because the reaction between the iron(III) ion and thiocyanate ion is practically irreversible. According to the given information below:
2 Fe³⁺(aq) + 3 SCN⁻(aq) → Fe(SCN)₂⁺(aq)
The red-brown Fe(SCN)₂⁺ complex is formed in beakers 2-7 due to the reaction of iron(III) ions and thiocyanate ions. Since the reaction is irreversible and occurs entirely to the right, the concentration of the Fe(SCN)₂⁺ complex equals the concentration of the SCN⁻ ion.
Therefore, the thiocyanate ion concentration equals the complex ion concentration in beakers 2-7.Let's use this information to provide an HTML-formatted answer below:
In beakers 2-7, the thiocyanate ion concentration is assumed to equal the complex ion concentration because the reaction between iron(III) ions and thiocyanate ions is practically irreversible.
According to the given information below:
2 Fe³⁺(aq) + 3 SCN⁻(aq) → Fe(SCN)₂⁺(aq)
The red-brown Fe(SCN)₂⁺ complex is formed in beakers 2-7 due to the reaction of iron(III) ions and thiocyanate ions. Since the reaction is irreversible and occurs entirely to the right, the concentration of the Fe(SCN)₂⁺ complex equals the concentration of the SCN⁻ ion. Therefore, the thiocyanate ion concentration equals the complex ion concentration in beakers 2-7.
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Calculating volume (formula) and density of regular shaped objects
Please help I need to complete this assignment fast :( I’m not sure on how to do it, If you don’t know how to do it don’t answer pls
The density of the unknown sample is 1.025 g / mL and its salt composition is 3.55 %.
How to solve
PART A: Density of a regular shaped object:
Trial 1: mass of the object = 162.20 g
volume of object = L x H x W = 4.90 cm x 3.90 cm x 2.90 cm
= 55.419 cm^3
Therefore density of the object = mass / volume = 162.20 g / 55.419 cm^3
= 2.9268 g/cm^3
trial 2: mass of the object = 162.18 g
volume of object = L x H x W = 4.89 cm x 3.90 cm x 2.88 cm
= 54.92448 cm^3
Therefore density of the object = mass / volume = 162.18 g / 54.92448 cm^3
= 2.9528 g/cm^3
Average = [ 2.9268 + 2.9528 ] /2 = 5.8796 / 2 = 2.9398 g / cm^3 = 1.94 g / cm^3.
The accepted value is 2.73 g / cm^3 for aluminium. The difference is 0.21
% error = 100 x difference / accepted value = 100 x 0.21/2.73 = 7.7 %.
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Part B: Determination of density of an irregular shaped object:
Trial 1:
mass of the marble chips = 10.25 g
Volume of the marble chip = final volume of water - initial volume of water
= 53.8 - 50 = 3.8 mL
Therefore density of marble chip = mass / volume = 10.25 g / 3.8 mL
= 2.697 g / mL
Trial 2:
mass of the marble chips = 10.32 g
Volume of the marble chip = final volume of water - initial volume of water
= 53.9 - 50.1 = 3.8 mL
Therefore density of marble chip = mass / volume = 10.32 g / 3.8 mL
= 2.716 g / mL
Average = [2.697 + 2.716] / 2 = 5.413 / 2 = 2.71 g / mL
The accepted density of marble chip = 2.70 g / mL The difference is 0.01
% error = 100 x difference / accepted value = 100 x 0.01/ 2.70 = 0.37 %.
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PART C: Determination of density of saline solution:
Trial 1:
Volume of the saline solution = 10 mL
mass of the saline solution = finall mass - initial mass
= 35.66 - 25.36 = 10.3 g
Density of the saline solution = mass / volume = 10.3 g / 10 mL = 1.03 g / mL
Trial 2:
Volume of the saline solution = 10 mL
mass of the saline solution = finall mass - initial mass
= 35.55 - 25.35 = 10.2 g
Density of the saline solution = mass / volume = 10.2 g / 10 mL = 1.02 g / mL
Average =[ 1.03 + 1.02 ] / 2 = 1.025 g / mL
Thus the unknown sample B has the density of 1.025 g / mL.
The composition of salt in this solution can be determined by interpolation.
salt % = 0 + 5 x [ 1.025-0.998] / [1.036 - 0.998] ( using the values given in the table )
= 0 + 5 x 0.027 / 0.038
= 3.55 %.
Thus the density of the unknown sample is 1.025 g / mL and its salt composition is 3.55 %.
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which of the following will affect the vapor pressure of a pure molecular substance? select all that apply. multiple select question. the external pressure the structure of the substance the strength of the intermolecular forces the temperature
As temperature increases, vapor pressure of substance also increases due to an increase in kinetic energy of the molecules. The correct answers are options: 1, 2, 3, 4.
As temperature increases, vapor pressure of a substance also increases due to an increase in kinetic energy of molecules Substances with stronger intermolecular forces will have lower vapor pressure because it requires more energy to break bonds between molecules and transition into gas phase. An increase in external pressure will decrease vapor pressure. Molecular size and shape of a substance can affect intermolecular forces and therefore its vapor pressure. For example, larger molecules tend to have stronger intermolecular forces, which result in lower vapor pressures. Options are 1, 2, 3, 4 correct .
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--The complete Question is, which of the following will affect the vapor pressure of a pure molecular substance?
select all that apply.
1. the external pressure
2. the structure of the substance
3. the strength of the intermolecular forces
4. the temperature
5. the weather conditions--
how many molecules of molecular oxygen react with four molecules of c6 h6 to form 24 molecules of carbon dioxide and twelve molecules of water?
60 molecules of oxygen react with 4 molecules of C6H6 to produce 24 molecules of CO2 and 12 molecules of H2O.
When C6H6 burns in oxygen gas, it reacts to produce carbon dioxide, water, and heat. The equation is:C6H6 + 15 O2 → 6 CO2 + 3 H2O
Equation shows that each molecule of C6H6 reacts with 15 molecules of oxygen to produce 6 molecules of carbon dioxide and 3 molecules of water.
molecules of oxygen react with 4 molecules of C6H6 to produce 24 molecules of CO2 and 12 molecules of H2O, we can use stoichiometry.
Stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction.
The balanced chemical equation shows that 15 molecules of O2 react with each molecule of C6H6 to produce 6 molecules of CO2 and 3 molecules of H2O.
Use his relationship to calculate the amount of oxygen needed to produce 24 molecules of CO2 and 12 molecules of H2O.
Use he ratio from the balanced equation, we can set up a proportion:15 molecules O2 / 1 molecule C6H6 = x molecules O2 / 4 molecules C6H6
4:15 molecules O2 / 1 molecule C6H6 = x molecules O2 / 4 molecules C6H64 x 15 molecules O2 / 1 molecule C6H6 = x molecules O2x = 60 molecules O2
Therefore, 60 molecules of oxygen react with 4 molecules of C6H6 to produce 24 molecules of CO2 and 12 molecules of H2O.
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5.how many electrons are exchanged in 2a? which species is oxidized and which is reduced?
In a 2A redox reaction, there are 4 electrons exchanged. The species that loses electrons is the oxidized species, and the species that gains electrons is the reduced species.
Explanation: In the given reaction, Fe is oxidized and Cr is reduced. There are six electrons exchanged in 2a.How many electrons are exchanged in 2a?In the given redox reaction,Fe2+(aq) + Cr2O72-(aq) → Fe3+(aq) + Cr3+(aq)The given reaction can be split into half reactions:Fe2+ (aq) → Fe3+ (aq) + e- (Oxidation)Cr2O72- (aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) (Reduction)The reaction Fe2+(aq) + Cr2O72-(aq) → Fe3+(aq) + Cr3+(aq) involves the exchange of six electrons in 2a.Therefore, there are six electrons exchanged in 2a.Which species is oxidized and which is reduced?In the given reaction, Fe is oxidized and Cr is reduced.The oxidation half-reaction Fe2+ (aq) → Fe3+ (aq) + e- has Fe on both the left and right sides of the equation. As a result, the oxidation state of iron has gone from +2 to +3. Therefore, iron has lost electrons and has been oxidized.The reduction half-reaction Cr2O72- (aq) + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(l) involves the gain of electrons by chromium. As a result, the oxidation state of chromium has gone from +6 to +3. Therefore, chromium has gained electrons and has been reduced.In the given reaction, Fe is oxidized and Cr is reduced.
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an unknown compound is analyzed and found to contain 0.1935 g of carbon, 0.0325 g of hydrogen, and 0.2043 g of fluorine.the molar mass of the compound is 240.23 g/mol. what quantity in moles of carbon are present in the compound?
The quantity of carbon present in moles is 3.36 x 10^23 moles.
The compound analyzed contains 0.1935 g of carbon, 0.0325 g of hydrogen, and 0.2043 g of fluorine.
The molar mass of the compound is 240.23 g/mol.
1. First, calculate the molecular mass of the compound by multiplying the mass of each element by its molar mass.
2. Divide the mass of carbon by the molecular mass of the compound.
3. Multiply the result by Avogadro's number (6.022 x 10^23).
Molecular mass = 0.1935 g x 12.011 g/mol (Carbon) + 0.0325 g x 1.008 g/mol (Hydrogen) + 0.2043 g x 18.998 g/mol (Fluorine) = 240.23 g/mol.
Moles of Carbon = 0.1935 g / 240.23 g/mol x 6.022 x 10^23 = 3.36 x 10^23 moles.
Therefore, the quantity of carbon present in moles is 3.36 x 10^23 moles.
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Write a statement to explain which characteristics of an atom determine the VSPER structure of an atom
The VSEPR model explains that each atom in a molecule with a central atom will achieve a geometry of the molecule which minimizes the repulsion between electrons of the molecule in the valence shell of that atom.
VSEPR Model can be used to predict the structure of any molecule with a central metal atom present in it. In the polyatomic molecules which is the molecules made up of three or more atoms and one of the constituent atoms is determined as the central atom to which all other atoms belonging to the molecule are linked together.
VSEPR theory explains five main shapes of simple molecules consisting the central atom. Those five structure basically are linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral geometry. Using the VSEPR theory, we predict that the electron bond pairs and lone pairs on the center atom will help us to predict the shape of a central atom of a molecule. Using this theory the shape of a molecule is determined by the location of the nuclei and its electrons of the molecule.
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None of the molecules featured in this lab disobeyed the octet rule (aside from hydrogen), but two common types of exceptions exist: provide an example of a molecule for each type of exception and explain how the atoms in these molecules are able to deviate from the octet rule. BE DETAILED!
Answer:
The octet rule is a guideline that suggests that atoms tend to combine in a way that allows each atom to have eight electrons in its outermost energy level (except for hydrogen, which is stable with two electrons). However, there are some molecules that do not obey the octet rule. Here are two common types of exceptions and examples of molecules that fall into each category:
Incomplete Octet: In this type of exception, the atoms in the molecule do not have a complete octet of valence electrons. Examples of molecules that have incomplete octets include beryllium chloride (BeCl2) and boron trifluoride (BF3).
In beryllium chloride, beryllium has only four valence electrons, while chlorine has seven. When the two atoms combine, beryllium shares its electrons with two chlorine atoms, but it still has only four electrons around it, which is fewer than the octet rule suggests. In boron trifluoride, boron has only three valence electrons, while fluorine has seven. When the two atoms combine, boron shares its electrons with three fluorine atoms, but it still has only six electrons around it, which is also fewer than the octet rule suggests.
Expanded Octet: In this type of exception, the atoms in the molecule have more than eight valence electrons. Examples of molecules that have expanded octets include sulfur hexafluoride (SF6) and phosphorus pentachloride (PCl5).
In sulfur hexafluoride, sulfur has six valence electrons, while each of the six fluorine atoms has seven valence electrons. When the atoms combine, sulfur shares its electrons with all six fluorine atoms, resulting in a total of 12 electrons around the sulfur atom, which is more than the octet rule suggests. In phosphorus pentachloride, phosphorus has five valence electrons, while each of the five chlorine atoms has seven valence electrons. When the atoms combine, phosphorus shares its electrons with all five chlorine atoms, resulting in a total of 10 electrons around the phosphorus atom, which is also more than the octet rule suggests.
In both cases, the atoms in these molecules are able to deviate from the octet rule due to the availability of empty d orbitals in the central atom that can accommodate additional electrons beyond the octet. Additionally, the size and electronegativity of the atoms involved in the bonding also play a role in determining whether the molecule will obey the octet rule or not.
research a common household chemical, a cosmetic compound, a medical drug, or something else that is commonly known and find out what its chemical name is.
The chemical name of water is hydrogen oxide.
Water is a compound with the chemical name hydrogen oxide (H2O).
It is a colorless, odorless, and tasteless liquid that is essential for most forms of life on Earth.
Water is a chemical molecule; therefore, its many forms have different names depending on their individual constituents. According to the nomenclature established by the IUPAC, water may alternatively be referred to as dihydrogen monoxide, dihydrogen oxide, hydrogen hydroxide, or hydric acid.
Being the primary component of Earth's hydrosphere and the fluids of all known forms of life, water (chemical formula H 2 O) is an inorganic, clear, tasteless, odorless, and almost colorless chemical substance (in which it acts as a solvent). None of the known forms of life could survive without it, despite the fact that it offers neither dietary energy nor organic micronutrients.
Water is made up of two hydrogen atoms and one oxygen atom, with the formula H2O.
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describe some initial experminents that ouwld be needed to be conducted in order to find the rate law for the overall reaction
In order to determine the rate law for an overall reaction, several experiments must be conducted. First, the reaction must be followed using an appropriate analytical technique such as spectroscopy or titrimetry.
These experiments include the following: To begin with, the reaction rate must be measured using different concentrations of reactants, including keeping one of the reactants constant and varying the other concentrations in one or two experiments.
Second, the reaction rate must be determined using several initial reactant concentrations. In this situation, the order of reaction must be determined in one or two experiments. The reaction order can be determined using graphical techniques or half-life measurements. The order of the reaction must be determined for all reactants.
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when 12.0 g of an unknown, non-volatile, non-electrolyte, x was dissolved in 100. g of benzene, the vapor pressure of the solvent decreased from 100 torr to 91.4 torr at 299 k. calculate the molar mass of the solute, x.
The molar mass of the solute x is 85.32 g/mol.
Let's use Raoult's law to solve the problem.The mass of the unknown, non-volatile, non-electrolyte solute = 12.0 g
Mass of the solvent = 100 g
The vapor pressure of the solvent before adding the solute = 100 torr
The vapor pressure of the solvent after adding the solute = 91.4 torr
Temperature = 299 K
Raoult's law can be written as:
P₂ = X₂ * P₁
Where:
P₁ = the vapor pressure of the pure solvent
P₂ = the vapor pressure of the solution
X₂ = the mole fraction of the solute
Solving for
X₂;X₂ = P₂/P₁ = 91.4/100
X₂ = 0.914
Calculate the moles of benzene;
n = 100g / 78.11 g/mol = 1.28 moles
X₂ = moles of solute / (moles of solute + moles of benzene)
Substituting the value of X₂ and moles of benzene;
n = 0.1406 moles
Now we need to calculate the moles of the solute;
Mass of solute = 12.0 g
Now, we will use the following formula to calculate the molar mass of the solute;
Molar mass = Mass of solute / Moles of solute
Molar mass = 12.0 g / 0.1406 moles
Molar mass of the solute is 85.32 g/mol.
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a reaction has a rate constant of 0.0117/s at 400.0 k and 0.689/s at 450.0 k. determine the activation barrier for the reaction in kj/mol. do not include units in your answer.
The activation barrier for the reaction in kJ/mol is ≈ 78.
The activation barrier for the reaction in kJ/mol can be calculated by using the Arrhenius equation.
The Arrhenius equation is represented by the following expression:
[tex]k = A^(^-^E^a^/^R^T^)[/tex]
Where k = rate constant
A = frequency factor (pre-exponential factor)
Ea = activation energy
R = gas constant
T = temperature
In the equation, the exponential term represents the probability of reactant molecules possessing enough energy to react. The activation energy (Ea) is the minimum energy required to initiate the reaction. The frequency factor represents the probability of a successful collision between reactant molecules. It is assumed that the frequency factor is constant within a given temperature range. The rate constant is a measure of the reaction rate.The activation barrier for the reaction in kJ/mol is given by the following expression:
Ea = (R)(ln(k2/k1))/(1/T1 - 1/T2)
Where k1 and k2 are the rate constants at temperatures T1 and T2, respectively.
R is the gas constant.
Here, k1 = 0.0117/s, k2 = 0.689/s, T1 = 400.0 K, T2 = 450.0 K and R = 8.314 J/K mol
Converting the units of R to kJ/K mol,
R = 8.314/1000 = 0.008314 kJ/K mol
Therefore, the activation barrier for the reaction in kJ/mol is given by the expression:
Ea = (0.008314 kJ/K mol) × ln (0.689/0.0117) / ((1/400.0 K) - (1/450.0 K)) ≈ 78 kJ/mol
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suppose 0.850 l of 0.400 m h2so4 is mixed with 0.800 l of 0.250 m koh . what concentration of sulfuric acid remains after neutralization?
The concentration of sulfuric acid that remains after neutralization is 0.056 M.
To find out what concentration of sulfuric acid remains after neutralization, you will need to use the balanced equation for the reaction:
H2SO4 + 2KOH → K2SO4 + 2H2O
First, you will need to determine the moles of each reactant in the solution.
Moles can be determined using the formula:
moles = concentration x volume
In this case:
moles of H2SO4 = 0.850 L x 0.400 M = 0.34 mol
moles of KOH = 0.800 L x 0.250 M = 0.2 mol
Since the reaction is a 1:2 ratio, you will need to determine which reactant is limiting the reaction.
To do this, compare the mole ratios of the reactants:
0.34 mol H2SO4 : 0.2 mol KOH = 1.7 : 1
Since the ratio of H2SO4 to KOH is greater than 1:2, KOH is the limiting reactant. Therefore, all of the KOH is used up in the reaction, leaving some H2SO4 unreacted.
To find the amount of H2SO4 remaining, you will need to use the mole ratio of H2SO4 to KOH.
Since 2 moles of KOH react with 1 mole of H2SO4, you can use the mole ratio:
0.2 mol KOH x (1 mol H2SO4 / 2 mol KOH) = 0.1 mol H2SO4 remaining
Finally, you can determine the concentration of the H2SO4 remaining:
concentration = moles / volume
concentration = 0.1 mol / (0.850 L + 0.800 L)
concentration = 0.056 M
Therefore, the concentration of sulfuric acid that remains after neutralization is 0.056 M.
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rank the steps in the sn1 mechanism proposed for the reaction of tert-butyl alcohol with hx.need help? review these concept resources.
The SN1 mechanism for the reaction of tert-butyl alcohol with aqueous HX involves the formation of an intermediate carbocation, which is then attacked by a halide ion (H⁻) to form the alkyl halide product.
The steps involved in the mechanism of the SN1 Reaction of tert-butyl alcohol with HX is as follows:Step 1:The reaction begins with the protonation of the tert-butyl alcohol molecule by HX.
Step 2: The highly reactive carbocation intermediate then undergoes loss of a leaving group, water(H₂O) resulting in the formation of the carbocation species, t-C₄H₉⁺.
Step 3: Subsequently, a halide ion from HX performs a nucleophilic attack on the carbocation species, forming the alkyl halide product, tert-C₄H₉X , and a hydronium ion.
Step 4: The reaction reaches completion with the release of the hydronium ion and the formation of the alkyl halide product.
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ethyl benzene is treated with (i) br2 and febr3 and (ii) br2 and light or heat separately. do you think the products will be same? justify your answer.
No, the products obtained from the reaction of ethylbenzene with [tex]Br_2[/tex] and [tex]FeBr_3[/tex] in the presence of light or heat will be different from the products obtained from the reaction of ethylbenzene with [tex]Br_2[/tex] / light or heat.
In the first reaction, [tex]Br_2[/tex] and [tex]FeBr_3[/tex] act as a source of electrophilic bromine, which attacks the aromatic ring of ethylbenzene, leading to the formation of 1-bromoethylbenzene. The mechanism for this reaction is an electrophilic aromatic substitution, where the electrophilic [tex]Br^+[/tex] ion is generated in situ by the reaction of [tex]Br_2[/tex] with [tex]FeBr_3[/tex].
In the second reaction, [tex]Br_2[/tex] acts as a source of free radical bromine, which undergoes a free radical substitution reaction with ethylbenzene, leading to the formation of 1,2-dibromoethylbenzene. This reaction proceeds through a free radical mechanism, where the [tex]Br_2[/tex] molecule is split into two free radicals by the action of light or heat.
Therefore, the products obtained from the two reactions will be different. In the first reaction, 1-bromoethylbenzene will be formed, while in the second reaction, 1,2-dibromoethylbenzene will be formed.
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what is the molar mass of sodium phosphate, na3po4? group of answer choices 69.96 g/mole 226.1 g/mole 354.0 g/mole 163.9 g/mole 118.0 g/mole
The molar mass of sodium phosphate, Na3PO4 is 163.9 g/mol. Molar mass is the mass of a mole of a substance. A mole is a quantity of substance that contains 6.022 × 1023 particles, such as atoms or molecules. Molar mass is typically calculated in grams per mole (g/mol).
Formula for finding the molar mass of a compound The molar mass of a compound can be calculated using the following formula; Molar mass (M) = sum of the atomic masses of all the atoms present in the compound. The atomic masses of all the elements can be obtained from the periodic table.
The molar mass of a substance is usually expressed in g/mol. Sodium phosphate is a combination of sodium and phosphate ions. It is found in different forms like dibasic and tribasic. Dibasic sodium phosphate is known as sodium hydrogen phosphate or NaHPO4, and tribasic sodium phosphate is known as Na3PO4.
Its chemical formula is Na3PO4.Sodium phosphate is commonly used as a saline laxative to clear the bowel before medical procedures. Sodium phosphate is also used in the food industry as a food additive, emulsifying agent, and thickener.
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why must a cell keep a similar concentration of dissolved substances with the fluid surrounding them?
A cell must keep a similar concentration of dissolved substances with the fluid surrounding them because it helps in maintaining homeostasis.
Homeostasis is the ability of the body to regulate its internal environment in order to maintain a stable, constant condition. For example, the body regulates temperature, blood sugar levels, pH levels, and other factors to maintain a stable internal environment.
When there is an imbalance in the concentration of dissolved substances between the cell and its surrounding fluid, the cell is at risk of losing or gaining too much water. This can cause the cell to swell or shrink, which can interfere with its normal functions.
To maintain homeostasis, the cell needs to regulate the movement of substances across its membrane in response to changes in the concentration of dissolved substances in the surrounding fluid. By doing so, the cell can maintain a stable internal environment and function properly.
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the decay rate for a radioactive isotope is 6.2 percent per year. find the half-life of the isotope. round to the nearest tenth of a year.
The half-life of the isotope is 11.2 years.
The half-life of a radioactive isotope is the time it takes for half of the atoms in a sample to undergo radioactive decay. For a radioactive isotope with a decay rate of 6.2 percent per year, the half-life can be calculated as follows:
Half-life = ln(2) / (decay rate) = ln(2) / 0.062 = 11.2 years (rounded to the nearest tenth)
To understand this calculation in further detail, it is helpful to consider the concept of radioactive decay in terms of probability. After one half-life has elapsed, there is a 50 percent chance that an atom will have decayed, and a 50 percent chance that it will remain undecayed. After two half-lives have elapsed, there is a 75 percent chance that an atom will have decayed, and a 25 percent chance that it will remain undecayed.
This concept can be applied to the equation above, as the probability of decay during a single time interval is equal to the decay rate multiplied by the length of the time interval. By solving this equation, the half-life of a given radioactive isotope can be determined.
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aqueous carbonic acid is obtained by the reaction of carbon dioxide gas and liquid water . write a balanced chemical equation for this reaction.
The balanced chemical equation for the reaction between carbon dioxide gas and liquid water to produce aqueous carbonic acid is given below.
[tex]CO_2(g) + H_2O(l)[/tex] ⇌ [tex]H_2CO_3(aq)[/tex]
Here, the forward reaction is the dissolution of carbon dioxide in water, and the reverse reaction is the release of carbon dioxide from carbonic acid.
Carbonic acid is a weak acid that forms when carbon dioxide reacts with water. It can be shown that the reaction between carbon dioxide and water is a reversible reaction, which means that the carbonic acid can also dissociate into carbon dioxide and water.
To write a balanced chemical equation, we follow these steps:
Write the chemical formulae of the reactants and products involved in the reaction.Write the unbalanced chemical equation by placing the reactants on the left-hand side of the arrow and the products on the right-hand side of the arrow.Balance the equation by adjusting the coefficients of the reactants and products such that the number of atoms of each element is equal on both sides of the equation.Using the above steps we get the following balanced chemical equation for the reaction of carbon dioxide and liquid water.
[tex]CO_2(g) + H_2O(l)[/tex] ⇌ [tex]H_2CO_3(aq)[/tex]
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Complete orbital diagrams (boxes with arrows in them) to represent the electron configuration of valence electrons of carbon before and after sp hybridization Drag the appropriate labels to their respective targets. Labels can be used once, more than once, or not at all. Reset Help Before hybridization 2s 2p After hybridization sp 2p
The electron configuration of valence electrons of carbon before and after sp hybridization are shown below:Before hybridization: 2s2 2p2After hybridization: sp2 2p2The orbital diagram before sp hybridization shows two electrons in the 2s orbital and two electrons in each of the 2p orbitals. After hybridization, the 2s orbital mixes with one of the 2p
orbitals to form two sp hybrid orbitals. These sp hybrid orbitals are oriented at 180° to each other, which allows maximum overlap with two 2p orbitals of the carbon atom. The remaining 2p orbital remains unhybridized and
unchanged. Therefore, the hybridized orbitals contain only one electron each and the unhybridized 2p orbital has two electrons.The boxes with arrows in the orbital diagram represent the orbitals and their electrons. The label "2s" is
dragged to the box representing the 2s orbital before hybridization. Similarly, the labels "2p" and "sp" are dragged to the boxes representing the unhybridized and hybridized orbitals after hybridization, respectively. The label "2p" is also dragged to the unhybridized 2p orbital after hybridization.
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calculate a) the molality of ch3oh (methanol) and b) mole fraction of solvent in a solution that is 7.50% by mass ch3oh in ch3ch2oh (ethanol).
The molality of CH3OH is 0.03077 m and the mole fraction of CH3OH is 0.1326.
To calculate the molality of CH3OH (methanol) and the mole fraction of solvent in a solution that is 7.50% by mass CH3OH in CH3CH2OH (ethanol), we can use the following steps:
1. Calculate the moles of CH3OH present in the solution:
Mass of CH3OH = 7.50% by mass × 0.100 L solution = 0.00750 L CH3OH
Moles of CH3OH = 0.00750 L ÷ 24.3 g/mol = 0.0003077 mol CH3OH
2. Calculate the molality of CH3OH:
Molality of CH3OH = moles of CH3OH ÷ 0.100 L solution
= 0.0003077 mol ÷ 0.100 L = 0.03077 m
3. Calculate the moles of CH3CH2OH present in the solution:
Mass of CH3CH2OH = 100% - 7.50% = 92.50% by mass × 0.100 L solution = 0.09250 L CH3CH2OH
Moles of CH3CH2OH = 0.09250 L ÷ 46.1 g/mol = 0.002005 mol CH3CH2OH
4. Calculate the mole fraction of CH3OH:
Mole fraction of CH3OH = moles of CH3OH ÷ total moles
= 0.0003077 mol ÷ (0.0003077 mol + 0.002005 mol) = 0.1326
Therefore, the molality of CH3OH is 0.03077 m and the mole fraction of CH3OH is 0.1326.
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a student does not transfer all of the unknown acid into the flask before titrating with an naoh solution that was correctly standardized. how does this mistake affect his recorded results?
This mistake would lead to inaccurate results because the unknown acid wasn't completely transferred into the flask. As a result, the recorded results won’t reflect the true acid concentration of the unknown acid.
In order to obtain accurate results, all of the unknown acid must be completely transferred into the flask before titrating with a NaOH solution that was correctly standardized.
When this step is not taken, the amount of acid titrated will not be an accurate representation of the unknown acid's concentration. This leads to a lower than expected titration result, which in turn leads to inaccurate results.
It is important to remember to transfer all of the unknown acid into the flask before titrating with a standardized NaOH solution. Doing so ensures that the titration results will accurately reflect the concentration of the unknown acid.
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g explain why adding a small amount of acid to a buffer does not change the ph but adding a large amount does change the ph.
Adding a small amount of acid to a buffer does not change the pH because the weak acid is quickly neutralized by the weak base present in the buffer.
The reaction forms new components which are able to absorb further amounts of acid or base, keeping the pH relatively constant.
However, adding a large amount of acid to the buffer can change the pH because it exceeds the capacity of the buffer to neutralize it. This will result in the pH becoming more acidic.
The buffer is composed of a weak acid and its conjugate base. When a small amount of acid is added to the buffer, the weak acid is quickly neutralized by the weak base, forming new components that are able to absorb additional amounts of acid or base.
This means that the pH of the buffer remains relatively constant, even when small amounts of acid or base are added.
However, when a large amount of acid is added to the buffer, it exceeds the buffer’s capacity to neutralize it.
This results in the pH becoming more acidic, as the acid molecules outnumber the molecules of the weak base in the buffer. The pH will only return to its original value when the buffer has been ‘recharged’ with the weak base.
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