Ch.15 - Chemical Equilibrium
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- The equilibrium concentrations in a gas mixture at a particular temperature are 0.13 M H2, 0.70 M I2, and 2.1 M HI. What equilibrium concentrations are obtained at the same temperature when 0.20 mol of HI is injected into an empty 500.0-mL container?
Problem 1
- What is the equilibrium expression for the reaction of iron metal with water vapor? (LO 15.2 and 15.6) 2 Fe(s) + 3 H2O(g) ⇌ Fe2O3(s) + 3 H2(g)
Problem 2
- Given the data for the following reactions at 298 K: N2(g) + O2(g) ⇌ 2 NO(g) Kp = 4.4 * 10^-31 NO(g) + 1/2 O2(g) ⇌ NO2(g) Kp = 1.5 * 10^6, calculate the value of the equilibrium constant Kp at 298 K for the reaction N2(g) + 2 O2(g) ⇌ 2 NO2(g). (LO 15.3) (a) Kp = 6.6 * 10^-25 (b) Kp = 1.3 * 10^-24 (c) Kp = 9.9 * 10^-19 (d) Kp = 5.4 * 10^-28
Problem 3
- Sulfur dioxide reacts with oxygen in a step in the production of sulfuric acid. 2 SO2(g) + O2(g) ⇌ 2 SO3(g), Kc = 7.9 * 10^4 at 1800 K. For an equilibrium mixture in which [SO2] = 4.5 * 10^-3 M and [O2] = 1.5 * 10^-3 M, what is [SO3]? (LO 15.4) (a) [SO3] = 6.2 * 10^-7 M (b) [SO3] = 4.9 * 10^-2 M (c) [SO3] = 0.73 M (d) [SO3] = 2.4 * 10^-3 M
Problem 4
- The reaction A21g2 + B21g2 ∆ 2 AB1g2 has an equilib- rium constant Kc = 9. The following figure represents a reaction mixture that contains A2 molecules (red), B2 mol- ecules (blue), and AB molecules. What statement about the mixture is true? (LO 15.5)
Problem 5
(a) The mixture is at equilibrium, and there will be no net shift in reaction direction. (b) The reaction will shift toward the reactants to reach equilibrium. (c) The reaction will shift toward the products to reach equilibrium. (d) More information is needed to answer this question.