Q4 of 54 Page 86

PCl5, PCl3 and Cl2 are at Equilibrium at 500K in a closed container and their concentrations are 0.8 × 10-3 mol L-1, 1.2 × 10-3 mol L-1 and 1.2 × 10-3 mol L-1 respectively. The value of Kc for the reaction PCl5 (g) ⇋ PCl3 (g) + Cl2 (g) will be

• For the reaction PCl5 (g) ⇋ PCl3 (g) + Cl2


The reaction Equilibrium constant Kc can be written as :


Hence, =


Kc = 1.8 × 10-3

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