Write out equilibrium constant expression (K) for the following reaction: Co_2(C

Question

Write out equilibrium constant expression (K) for the following reaction: Co_2(Co_3)_3 (s) doubleheadarrow 2Co^3+ (aq) + 3CO^2 _3 (aq) K = [Co^3+]^2 [CO^2- _3]^3 K = [2Co^3+] [3CO^2- _3] K = [Co^3+]^2 [CO^2- _3]^3/[Co_2(CO_3)_3] K = [Co_2 (CO_3)_3]/[Co^3+]^2 [CO^2- _3]^3 Calculate K_p for the following reaction given the equilibrium concentrations of [PCl_5] = 0.9 atm, [PCl_3] = 1.2 atm, and [Cl_2] = 0.3 atm. PCl_5 (g) doubleheadarrow PCl_3 (g) + Cl_2(g) K_p = 2.5 K_p = 0.40 K_p = 3.6 K_p = 0.23

Explanation / Answer

1) Option A is correct

Equilibrium constant expression is the ratio of concentration terms of products to the concentration terms of reactants. The activity of solids and liquids are 1 so Co2(CO)3 is not involved in equilibrium constant expression.

2) Kp = [PCl3][Cl2] / [PCl5]

Kp = (1.2)(0.3) / 0.9

Kp = 0.36 / 0.9 = 0.40

Option B is correct

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