Equilibrium Constant Calculation

At equilibrium, a system exhibits a constant concentration of reactants and products. Consider the following reversible reaction at a specified temperature:

A(g) + B(g) <=> C(g) + D(g)

The equilibrium constant (K_c) for this reaction is defined as:

K_c = [C][D] / [A][B]

If the initial concentrations of the reactants A and B are both 1.0 M, and at equilibrium the concentration of C is found to be 0.5 M, what will be the equilibrium constant K_c for the reaction?