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For the reaction – Fe2N(s) + 3/2 H2(g) ⇌ 2Fe(s) + NH3(g)

1. Kc = Kp(RT)
2. Kc = Kp(RT)−3/2
3. Kc = Kp(RT)−1/2
4. Kc = Kp(RT)1/2

Correct answer: Kc = Kp(RT)−1/2

Solution

The relationship between Kc and Kp is determined by the change in moles of gas during the reaction. In this case, the reaction produces 1 mole of gas (NH3) and consumes 1.5 moles of gas (3/2 H2), resulting in a net decrease of 0.5 moles, which leads to the equation Kc = Kp(RT)^{-1/2}.

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