Final answer:
The equilibrium constant expression for the reaction is (C)c(D)d / (A)a(B)b. This expression represents the ratio of the concentrations of the products (raised to their respective coefficients) to the concentrations of the reactants (raised to their respective coefficients).
Step-by-step explanation:
The equilibrium constant expression for the reaction is (C)c(D)d / (A)a(B)b. This expression represents the ratio of the concentrations of the products (raised to their respective coefficients) to the concentrations of the reactants (raised to their respective coefficients). It shows the relationship between the concentrations of the reactants and products at equilibrium.