Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-----> PCl3 (g)+ Cl2(g); Kc= 1.80 at 250 °C
A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.