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For SO3(g) <-> SO2(g) + 1/2 O2(g), Kc = 5 * 10⁻². What is Kc for the reaction 2 SO2(g) + O2(g) <-> 2 SO3(g)?

1. 400
2. 2.40 * 10⁻³
3. 9.8 * 10⁻²
4. 4.9 * 10⁻²

Correct answer: 400

Solution

The target reaction is the reverse of the given one, doubled, so K = (1/Kc)² = (1/0.05)² = 400.

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