help me out and pleas check u works

A 3.00-L vessel contained 9.10×10-2 mol of gaseous PCl3, 9.48×10-2 mol of gaseous PCl5, and 8.80×10-2 mol of Cl2 gas at equilibrium at 242°C. 
Calculate the value of Keq (expressed in terms of the molar concentrations) for the reaction

PCl3(g) + Cl2(g PCl5(g)

 
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