SOLVED

11) Choose the INCORRECT statement. A) A certain amount of energy, called the activation energy, must be available if a reaction is to take place. B) A reversible chemical reaction is one in which equilibrium is never established due to the constant decomposition of the products. C) When the rate of the reverse reaction equals the rate of the forward reaction, equilibrium has been established. D) Changes in temperature will change the value of an equilibrium constant. E) Chemical equilibrium is a dynamic equilibrium. 12) What is the value for Kc if [CO] = 0.025, [H2] = 0.013 and [CH3OH] = 0.0028 for the following reaction? CH3OH(g) ? CO(g) + 2 H2(g) A) 1.5 × 10-3 B) 0.12 C) 6.6 × 102 D) 8.6 E) 9.1 × 10-7 13) What is the value for Kc for the reaction below if the equilibrium concentrations are [N2] = 0.025, [H2] = 0.0013 and [NH3] = 0.028 for the following reaction? N2(g) + 3 H2(g) ? 2 NH3(g) A) 8.6 × 102 B) 1.4 × 107 C) 1.2 × 10-3 D) 7.1 × 10-8 E) 7.4 × 105 14) For the reaction: H2(g) + I2(g) ? 2 HI(g), Kc = 92.0 When equilibrium concentrations of HI and I2 are [HI] = 0.115 M and [I2] = 0.250 M, the equilibrium concentration of [H2] is: A) 5.00 × 10-3 M B) 5.75 × 10-4 M C) 1.74 × 103 M D) 0.135 M E) 9.56 M 15) Given that the equilibrium concentrations of [N2] = 0.035 M, [C2H2] = 0.057 M, and [HCN] = 6.8 × 10-4 M, find the value of the equilibrium constant expression for the reaction: N2(g) + C2H2(g) ? 2 HCN A) 3.4 × 10-1 B) 2.9 C) 4300 D) 2.3 × 10-4 E) 6.8 × 10-1 16) For which of the following reactions does Kp = Kc? A) 3Fe(s) + 4H2O(g) ? Fe3O4(s) + 4H2(g) B) C(s) + H2O(g) ? CO(g) + H2(g) C) 2SO2(g) + O2(g) ? 2SO3(g) D) H2(g) + I2(s) ? 2HI(g) 17) Which of the following substances present in the chemical reaction would be excluded from the equilibrium constant expression? A) Na+ (aq) B) H2O(g) C) Cl- D) H2O(l) (reactant and solvent) E) CO(g) 18) Given the following: I) N2O(g) + 1/2 O2(g) ? 2NO(g)Kc = 1.7 × 10-13 II) N2(g) + O2(g) ? 2NO(g)Kc = 4.1 × 10-31 Find the value of the equilibrium constant for the following equilibrium reaction: N2(g) + 1/2 O2(g) ? N2O(g) A) 7.0 × 10-44 B) 4.2 × 1017 C) 2.4 × 10-18 D) 1.6 × 10-9 E) 2.6 × 10-22 19) For the following chemical equilibrium, Kp = 4.6 × 10-14 at 25°C, find the value of Kc for this reaction at 25°C. 2 Cl2(g) + 2 H2O(g) ? 4 HCl(g) + O2(g) A) Kc = 1.9 × 10-15 B) Kc = 2.2 × 10-14 C) Kc = 1.1 × 10-12 D) Kc = 9.4 × 10-14 E) Kc = 4.6 × 10-14 20) Which of the following equilibrium constants-reaction type is INCORRECT? A) 1.4 × 1083 goes to completion. B) 1.6 × 10-23 does not occur. C) 1.8 × 10-5 equilibrium reaction more reactants than products at equilibrium. D) 1.0 equilibrium reaction-equal amounts of products and reactants. E) 3.2 × 103 equilibrium reaction-more reactants than products at equilibrium.