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Practice question

MCQ

Question

For 2A(g) <=> B(g) + C(g) , Kc = 0.04 at 300 K. If 0.8 mol A is in a 2 L vessel, what is [B] at equilibrium?

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Explanation

Initial: [A] = 0.4 M , [B] = [C] = 0 . Let x = [B] = [C] , [A] = 0.4 - 2x . Kc = ([B][C]/[A]²) = (x²/(0.4 - 2x)²) = 0.04 , (x/0.4 - 2x) = 0.2 , x = 0.08 - 0.4x , x ≈ 0.057 M .

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