At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g), CO(g) + H2O(g) ⇌ CO2(g) + H2(g) CH4(g) + 2H2O(g) ⇌ CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?
Correct answer: A. K3 = K1.K2
- A. K3 = K1.K2
- B. K3 = (K1.K2)0.5
- C. K3(K1+K2)/2
- D. K3 = (K1.K2)2
Explanation
Adding reactions adds their standard Gibbs-energy changes, while equilibrium constants multiply. Adding reactions 1 and 2 gives reaction 3, so K3 = K1K2.
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