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In a system at equilibrium within a closed container, how does temperature influence the equilibrium constant K in relation to entropy changes?

1. As temperature rises, K decreases for exothermic reactions because the system's entropy change is positive.
2. As temperature rises, K increases for endothermic reactions because the system's entropy change is negative.
3. As temperature rises, K increases for endothermic reactions because the unfavourable entropy change in the surroundings becomes smaller.
4. As temperature rises, K decreases for exothermic reactions because the favourable entropy change in the surroundings becomes smaller.

Correct answer: As temperature rises, K increases for endothermic reactions because the unfavourable entropy change in the surroundings becomes smaller.

Solution

As temperature rises, the equilibrium constant K increases for endothermic reactions because the unfavourable entropy change in the surroundings becomes smaller, allowing the reaction to proceed further to the right.

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