Problem: Phosphorus pentachloride decomposes according to the chemical equation PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)    Kc = 1.80 at 250°C A 0.179 mol sample of PCI5(g) is injected into an empty 2.50 L reaction vessel held at 250°C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.

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Phosphorus pentachloride decomposes according to the chemical equation 

PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)    Kc = 1.80 at 250°C 

A 0.179 mol sample of PCI5(g) is injected into an empty 2.50 L reaction vessel held at 250°C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.