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16. Chemical Equilibrium

Kp and Kc

16. Chemical Equilibrium

Kp and Kc

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Kp and Kc Example

Kp and Kc Example

Kp and Kc Example

Kp and Kc Example

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Multiple Choice

Partial pressures of the following equilibrium mixture at 955 K are: 130 torr methane, 92 torr hydrogen sulfide, 167 torr hydrogen gas and 532 torr carbon disulfide. What is the value of Kc at 955 K?

CH4(g) + 2 H2S(g) ⇌ 4 H2(g) + CS2(g)

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Multiple Choice

Consider the hypothetical reaction: ? X(g) + 3 Y(g) ⇌ 3 Z(g), where K_p = 1.16 x 10^–3 and K_c = 1.3 at 135°C. Find the value of the coefficient of X.

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Multiple Choice

For which reaction(s) will K_p = K_c?

a) N₂(g) + O₂(g) ⇌ 2 NO(g)

b) CaCO₃(s) ⇌ CaO(s) + CO₂(g)

c) 2 CH₄(g) ⇌ C₂H₂(g) + 3 H₂(g)

d) H₂O(g) + CO(g) ⇌ H₂(g) + CO₂(g)

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Multiple Choice

Select the correct choice below for the reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

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Textbook Question

The following diagram represents a reaction shown going to completion. Each molecule in the diagram represents 0.1 mol, and the volume of the box is 1.0 L. (d) Assuming that all of the molecules are in the gas phase, calculate n, the change in the number of gas molecules that accompanies the reaction. [Section 15.2]

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Textbook Question

Suppose that the gas-phase reactions A ¡ B and B ¡ A are both elementary processes with rate constants of 4.7 * 10-3 s-1 and 5.8 * 10-1 s-1, respectively. (b) Which is greater at equilibrium, the partial pressure of A or the partial pressure of B?

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Textbook Question

If Kc = 0.042 for PCl31g2 + Cl21g2 Δ PCl51g2 at 500 K, what is the value of Kp for this reaction at this temperature?

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Textbook Question

At 1000 K, Kp = 1.85 for the reaction SO21g2 + 12O21g2 Δ SO31g2 (c) What is the value of Kc for the reaction in part (b)?

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Textbook Question

Calculate Kc for each reaction. a. I2(g) ⇌ 2I(g) Kp = 6.26 * 10^-22 (at 298K)

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Textbook Question

Calculate Kc for each reaction. b. CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) Kp = 7.7x10^24 (at 298 K)

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Textbook Question

Calculate Kp for each reaction. a. N2O4(g) ⇌ 2NO2(g) Kc = 5.9x10^-3 (at 298 K)

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Textbook Question

Calculate Kp for each reaction. b. N2(g) + 3H2(g) ⇌ 2NH3(g) Kc = 3.7x10^8 (at 298 K)

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Textbook Question

The equilibrium 2 NO1g2 + Cl21g2 Δ 2 NOCl1g2 is established at 500 K. An equilibrium mixture of the three gases has partial pressures of 0.095 atm, 0.171 atm, and 0.28 atm for NO, Cl2, and NOCl, respectively. (b) If the vessel has a volume of 5.00 L, calculate Kc at this temperature.

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Textbook Question

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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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

The equilibrium constant Kc for the gas-phase thermal decom-position of cyclopropane to propene is 1.0 * 105 at 500 K:

(a) What is the value of Kp at 500 K?

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