A 4.00-L vessel contained 1.53×10-1 mol of gaseous PCl3, 1.43×10-1 mol of gaseous PCl5, and 1.20×10-1 mol of Cl2 gas at equilibrium at 245°C.
Calculate the value of Keq (expressed in terms of the molar concentrations) for the reaction:

PCl3(g) + Cl2(g) ⇌ PCl5(g)