Q18 of 54 Page 86

At 500 K, Equilibrium constant, Kc, for the following reaction is 5.

1/2 H2(g) + 1/2 I2 (g) ⇋ HI (g)


What would be the Equilibrium constant Kc for the reaction


2HI (g) ⇋ H2(g) + I2 (g)


• For the reaction :


1/2 H2(g) + 1/2 I2 (g) ⇋ HI (g) Kc = [HI] = 5 (given)


For the reaction


H2(g) + I2 (g) ⇋2HI (g) , ) Kc = [HI]2 = (5)2 = 25


Hence, for the reaction 2HI (g) ⇋ H2(g) + I2 (g) , the value of Kc will be = = 1/25 = 0.04.

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