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Chemical Equilibrium Equilibrium Constant Kc

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For A + B ⇌ C + D, equal initial concentrations of A and B are used. At equilibrium, the concentration of C is twice that of A. The value of Kc is:

Verified Answer & Explanation⌄

Correct Answer: A) 4

Concept Explanation

If equilibrium [A] = [B] = x, then [C] = [D] = 2x, so Kc = (2x × 2x)/(x × x) = 4.

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