The equilibrium constant, Ke, for the following reaction is 1.20x10-2 at 500 K. PCI:(g) PCI3(9) + Cl2(g) Calculate the equilibrium concentrations of reactant and products when 0.275 moles of PCI,(g) are introduced into a 1.00 L vessel at 500 K. (PCIS) M [PCI,)= M.