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in Chemistry by (64.7k points)

At 473 K, equilibrium constant, Kc for decomposition of phosphorus pentachloride, PCl5 is 8.3 x 10-3. If decomposition is depicted as

PCl5(g) ⇌ PCl3(g) + Cl2(g);

ΔH = 124.0 kJ mol-1

What would be the effect on Kc if (i) more PCl5 is added (ii) the pressure is increased (iii) the temperature is increased?

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(i) When more PCl5 is added to the reaction mixture, the concentration of PCl5 and Cl2 will increase in such a way that the value of Kc remains unchanged.

(ii) When pressure is increased, the reaction will move in a direction of lower volume, i.e., backwards. As a result, the value of Kc will decrease.

(iii) The reaction is endothermic in nature. Therefore, increase in temperature will favour the forward reaction. As a result, the value of Kc will increase.

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