Chemistry Problem Set 1

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Questions and Answers

Consider the following reaction: 2SO2(g) + O2(g) ↔ 2SO3(g) Keq = 100 With the initial masses of 20 g SO2, 13 g O2, and 25 g SO3 in a 5.0 L container, which way will the reaction progress?

  • There is not enough information to determine which way the reaction will progress.
  • The reaction will progress to the right, favoring the products. (correct)
  • The reaction is already at equilibrium.
  • The reaction will progress to the left, favoring the reactants.

Consider the following reaction: cis-C2H2F2↔ trans-C2H2F2 Keq = 0.500. If 1 mol cis-C2H2F2 is mixed with 1 trans-C2H2F2 in a volume of 10-Liters at 623 Kelvin, what would happen to each of these isomers when the mixture is allowed to equilibrate? Note: Equilibrium mixtures of isomers typically contain more of the cis isomer than the trans isomer. What is the value of x (mol) in the table below?

0.167

Consider the following reaction: cis-C2H2F2↔ trans-C2H2F2 Keq = 0.500. If 1 mol cis-C2H2F2 is mixed with 1 trans-C2H2F2 in a volume of 10-Liters at 623 Kelvin, what would happen to each of these isomers when the mixture is allowed to equilibrate? What is the equilibrium concentration of [cis-C2H2F2] in the mixture in mol/L?

0.117

Two methanol-water mixtures are contained in separate flasks. The first mixture contains 40.0 wt% methanol and the second contains 70.0 wt% methanol. The product stream contains a mixture of methanol and water. If 200 g of the first mixture is combined with 150 g of the second, what is the mass of methanol in the product stream?

<p>125</p> Signup and view all the answers

Two methanol-water mixtures are contained in separate flasks. The first mixture contains 40.0 wt% methanol and the second contains 70.0 wt% methanol. The product stream contains a mixture of methanol and water. If 200 g of the first mixture is combined with 150 g of the second, what is the mass of water in the product stream?

<p>225</p> Signup and view all the answers

Flashcards

Equilibrium Constant (Keq)

The ratio of products to reactants at equilibrium, indicating the extent of a reaction's completion.

Chemical Equilibrium

The state where the rates of forward and reverse reactions are equal, leading to constant concentrations of reactants and products.

Le Chatelier's Principle (Pressure)

The reaction will shift towards the side with fewer moles of gas to reduce pressure.

Le Chatelier's Principle (Heat)

The reaction will shift towards the side with more heat absorption (endothermic) to relieve the stress of added heat.

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Product-Favored Reaction

A reaction that favors the formation of products, indicated by a Keq value greater than 1.

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Reactant-Favored Reaction

A reaction that favors the formation of reactants, indicated by a Keq value less than 1.

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Concentration

The amount of a substance present in a given volume, expressed in units like mol/L.

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Reversible Reaction

A reaction that proceeds in both directions, reactants forming products and products forming reactants simultaneously.

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Rate of Reaction

The change in concentration of a reactant or product over time, typically measured in mol/L·s.

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Equilibrium Calculations

The process of calculating the amounts of reactants and products present at equilibrium based on initial conditions and Keq.

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Weight Percent (wt%)

The mass of a component in a mixture expressed as a percentage of the total mixture mass.

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Homogeneous Mixture

A mixture where the components are uniformly distributed throughout, meaning the same concentration everywhere.

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Heterogeneous Mixture

A mixture where the components are not evenly distributed, meaning different concentrations in different parts.

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Distillation

The process of separating components of a mixture based on their different boiling points.

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Extraction

The process of separating components of a mixture based on their different solubilities in a solvent.

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Solubility

The amount of a solute that can dissolve in a given amount of solvent at a specific temperature.

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Solvent

The substance present in a larger amount in a solution, typically a liquid.

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Solute

The substance present in a smaller amount in a solution, typically dissolved in the solvent.

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Solution

A homogeneous mixture of two or more substances, where one substance is dissolved in another.

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Study Notes

Problem Set 1

  • Problem 1: A chemical reaction involves sulfur dioxide (SO2), oxygen (O2), and sulfur trioxide (SO3). Initial masses are given. Calculate whether the reaction will shift forward or backward to reach equilibrium.

  • Problem 2: A cis-trans isomerization reaction for C2H2F2 is given. An equilibrium constant (Keq) is provided. The reaction involves 1 mole of cis-C2H2F2 and 1 mole of trans-C2H2F2 in 10 liters and a given temperature. A table is provided to track the initial and equilibrium amounts of each isomer.

  • Problem 3: Two methanol-water mixtures with different compositions are combined. Calculate the mass and percentage composition (wt%) of the resultant mixture. Initial masses and percentages of each mixture are given.

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