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For the equilibrium reaction: CO(g) + (1/2)O2(g) ⇌ CO2(g), the ratio Kp / Kc equals:

1. 1 / (RT)
2. sqrt(RT)
3. 1 / sqrt(RT)
4. RT

Correct answer: 1 / sqrt(RT)

Solution

The relationship between Kp and Kc is Kp = Kc * (RT)^(delta n). Here delta n = 1 - (1 + 1/2) = -1/2. So Kp = Kc * (RT)^(-1/2), giving Kp/Kc = (RT)^(-1/2) = 1/sqrt(RT).

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