Equilibrium Concentration from Initial Conditions

Consider the reaction $CO(g) + Cl_2(g) \rightleftharpoons COCl_2(g)$, which has an equilibrium constant of $K_c = 10$. If a reaction is initiated with initial concentrations of $[CO] = 0.5\,M$ and $[Cl_2] = 0.5\,M$, what is the concentration of $COCl_2$ at equilibrium?