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For the equilibrium CuSO4.5H2O(s) <=> CuSO4.3H2O(s) + 2H2O(g), which representation is correct?

1. Kp = (P(H2O))²
2. Kc = [H2O]²
3. Kp = Kc(RT)²
4. All

Correct answer: All

Solution

Solids are excluded, so Kp depends only on the squared water-vapour pressure and Kc on [H2O]²; since delta-n(gas) = 2, Kp = Kc(RT)². All three expressions are correct.

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