PC15, PC13 and Cl2 are at equilibrium at 500 K in a closed container and their concentrations are 0.8 x 10"3 molL-1, 1.2 x 10-3 mol L 1 and 1.2 x 10-3 mol L-1 The value of Kc for the reaction PCl5(g) ⇌PCl3(g) + Cl2(g) will be
