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For which reaction is the relationship log(Kp/Kc) + log RT = 0 valid?

1. PCl5 = PCl3 + Cl2
2. 2SO2 + O2 = 2SO3
3. N2 + 3H2 = 2NH3
4. (B) and (C) both

Correct answer: 2SO2 + O2 = 2SO3

Solution

log(Kp/Kc) + log RT = 0 requires delta n_g = -1; the reaction 2SO2 + O2 = 2SO3 has delta n_g = 2 - 3 = -1, so it satisfies the relation.

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