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Equilibrium constants are given for three gas-phase reactions: (1) CO(g) + H2O(g) <=> CO2(g) + H2(g), K1 (2) CH4(g) + H2O(g) <=> CO(g) + 3H2(g), K2 (3) CH4(g) + 2H2O(g) <=> CO2(g) + 4H2(g), K3 Which relation among K1, K2 and K3 is correct?

1. K1*sqrt(K2) = K3
2. K2*K3 = K1
3. K3 = K1*K2
4. K3 = K3² * K1²

Correct answer: K3 = K1*K2

Solution

Reaction 3 is the sum of reactions 1 and 2, so K3 = K1 * K2.

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