Chapter 10 - Reaction Rates and Chemical Equilibrium - 10.3 Equilibrium Constants - Questions and Problems - Page 383: 10.13

a. $$K_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}$$ b. $$K_c = \frac{[N_2][O_2]}{[NO]^2}$$ c. $$K_c = \frac{[CS_2][O_2]^4}{[SO_3]^2[CO_2]}$$ d. $$K_c = \frac{[H_2]^3[CO]}{[CH_4][H_2O]}$$

The formula for the equilibrium constant expression is: $$K_c = \frac{[Products]}{[Reactants]}$$ Also, the coefficients in the equation are the exponents of the concentrations.