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Ch.15 - Chemical Equilibrium
All textbooksMcMurry 8th EditionCh.15 - Chemical EquilibriumProblem 58
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Chapter 15, Problem 58

For each of the equilibria in Problem 15.56, write the equi-librium constant expression for Kp and give the equation that relates Kp and Kc. (a)

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Equilibrium Constant (Kp)

The equilibrium constant Kp is a numerical value that expresses the ratio of the partial pressures of the products to the reactants at equilibrium for a gaseous reaction. It is derived from the balanced chemical equation and is specific to a given temperature. Kp is particularly useful for reactions involving gases, as it directly relates to their partial pressures.
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Equilibrium Constant (Kc)

Kc is the equilibrium constant that expresses the ratio of the concentrations of products to reactants at equilibrium for a reaction in solution. It is calculated using molarity (moles per liter) and is also temperature-dependent. Kc is applicable to reactions involving aqueous solutions and is essential for understanding how concentration changes affect equilibrium.
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Relationship between Kp and Kc

The relationship between Kp and Kc is given by the equation Kp = Kc(RT)^(Δn), where R is the ideal gas constant, T is the temperature in Kelvin, and Δn is the change in the number of moles of gas (moles of products minus moles of reactants). This equation allows for the conversion between the two constants, depending on whether the reaction is analyzed in terms of partial pressures or concentrations.
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The following pictures represent the initial and equilibrium states for the exothermic decomposition of gaseous A mol- ecules (red) to give gaseous B molecules (blue). (a) Write a balanced chemical equation for the reaction.

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Textbook Question
Identify the true statement about the rate of the forward and reverse reaction once a reaction has reached equilibrium. (a) The rate of the forward reaction and the reverse reaction is zero. (b) The rate of the forward reaction is greater than the rate of the reverse reaction. (c) The rate of the reverse reaction is greater than the rate of the forward reaction. (d) The rate of the forward reaction is equal to the rate of the reverse reaction.
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Textbook Question

The reaction 2 AsH31g2 ∆ As21g2 + 3 H21g2 has Kp = 7.2 * 107 at 1073 K. At the same temperature, what is Kp for each of the following reactions? (a) As21g2 + 3 H21g2 ∆ 2 AsH31g2

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Textbook Question
The vapor pressure of water at 25 °C is 0.0313 atm. Cal- culate the values of Kp and Kc at 25 °C for the equilibrium H2O1l2 ∆ H2O1g2.
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Textbook Question
For each of the following equilibria, write the equilibrium constant expression for Kc. Where appropriate, also write the equilibrium constant expression for Kp. (a) Fe2O31s2 + 3 CO1g2 ∆ 2 Fe1l2 + 3 CO21g2
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