Under certain conditions, the equilibrium constant Kc for th…

Under certain conditions, the equilibrium constant Kc for the decomposition of PCl5(g) into PCl3(g) and Cl2(g) is 0.0211. What are the equilibrium concentrations of PCl5, PCl3 and Cl2 in a mixture that initially contained only PCl5 at a concentration of 1.00 M? PCl5 (g) ⇄ PCl3 (g)+Cl2 (g)