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For the following reactions, write Kc expressions and predict direction of the reactions based on the magnitude of their equilibrium constants.

i. 2H2(g) + O2(g) ⇌ 2H2O(g) , Kc = 2.4 × 1047 at 500 K

ii. 2H2O(g) ⇌ 2H2(g) + O2(g) , Kc = 4.2 × 10-48 at 500 K

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i. a. Kc expression:

b. For the reaction, Kc = 2.4 × 1047 at 500 K

If the value of Kc >>> 103 , forward reaction is favoured. 

Hence, the given reaction will proceed in the forward direction and will nearly go to completion.

ii. a. Kc expression:

b. For the reaction, Kc = 4.2 × 10-48 at 500 K If the value of K <<< 10-3 , reverse reaction is favoured.

Hence, the given reaction will proceed in the backward direction and will nearly go to completion.

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