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For the exothermic equilibrium 2SO2(g) + O2(g) <=> 2SO3(g) (ΔH is negative), raising the temperature will cause:

1. Greater dissociation of SO3 and a decrease in Kc
2. Less dissociation of SO3 and an increase in Kc
3. Greater dissociation of SO3 and an increase in Kc
4. Less dissociation of SO3 and a decrease in Kc

Correct answer: Greater dissociation of SO3 and a decrease in Kc

Solution

Since the forward reaction is exothermic, increasing temperature shifts equilibrium backward, decomposing more SO3 and lowering Kc.

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