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A (g) B (g) + 2 C (g). The correct relationship between Kp, α and equilibrium pressure P is

1. K P = 2 / 1 2 / 1 2 / 1 ) 2 ( P α + α
2. K P = 2 / 3 2 / 3 2 / 1 ) 2 ( P α + α
3. K P = ) 1 ( ) 2 ( P 2 / 1 2 / 1 2 / 3 α − α + α
4. K P = 2 / 3 2 / 1 2 / 1 ) 2 ( P α + α

Correct answer: K P = ) 1 ( ) 2 ( P 2 / 1 2 / 1 2 / 3 α − α + α

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