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For the reaction SO2(g) + 1/2 O2(g) <=> SO3(g), the relation Kp = Kc(RT)^x holds (assuming ideal gases). What is the value of x?

1. 1/2
2. 1
3. -1
4. -1/2

Correct answer: -1/2

Solution

delta-n(gas) = 1 - (1 + 1/2) = -1/2, so x = -1/2.

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