Equilibrium law questions

1. Phosphorus(V) chloride decomposes when heated according to the equation:PCl5(g) ⇌ PCl3(g) + Cl2(g)Assume that the total volume is fixed at V dm3 and that an initial amount of phosphorus(V) chloride of a mol gives x mol of chlorine in the equilibrium mixture. The equilibrium constant is represented by Kc.(a) Show that the equilibrium expression for this reaction is:Kc = x2 / (a – x)V

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