Chemistry · Chemical Equilibrium

The equilibrium composition for the reaction PCl3 + Cl2 ⇌ PCl5 at 298 K is given as: [PCl3]eq = 0.2 mol L-1, [Cl2]eq = 0.1 mol L-1, and [PCl5]eq = 0.40 mol L-1. If 0.2 mol of Cl2 is added at the same temperature, the new equilibrium concentration of PCl5 is approximately _________ × 10-2 mol L-1. (Given Kc = 20)