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In which of the following equilibria is Kp greater than Kc? I. 2NH3(g) <-> N2(g) + 3H2(g), T = 400 K II. SO2Cl2(g) <-> SO2(g) + Cl2(g), T = 450 K III. NH4NO2(s) <-> N2(g) + 2H2O(l), T = 370 K

1. I, II, III
2. I, III
3. II, III
4. I and II

Correct answer: I, II, III

Solution

All three reactions have Δng > 0 (I: +2, II: +1, III: +1 counting only gases), so Kp = Kc*(RT)^Δng > Kc for all three since RT > 1 at the given temperatures.

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