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For which of the following gaseous equilibria is Kp equal to Kc?

1. 2NOCl(g) <-> 2NO(g) + Cl2(g)
2. N2(g) + 3H2(g) <-> 2NH3(g)
3. H2(g) + I2(g) <-> 2HI(g)
4. 2SO2(g) + O2(g) <-> 2SO3(g)

Correct answer: H2(g) + I2(g) <-> 2HI(g)

Solution

Kp equals Kc only when delta n_gas = 0; for H2 + I2 <-> 2HI, moles of gas are 2 on each side, so delta n = 0.

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