The equilibrium constant K_c = 1.1 times 10^-2 for the following reaction at 400, K: PCl_5 (g) PCl_3(g) + Cl_2(g) (a) Given that 1.0 g of PCl_5 was initially placed in a 250. ml reaction vessel, determine the molar concentrations in the mixture at equilibrium. (b) What percentage of PCl_5 is decomposed at 400. K?