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For the equilibrium A2 ⇌ 2A, the equilibrium constant expression can be represented as which of the following?

1. Kc = [A]^2/[A2]
2. Kc = [A2]/[A]^2
3. Kc = [A]/[A2]
4. None of the above

Correct answer: Kc = [A]^2/[A2]

Solution

The equilibrium constant expression for the reaction A2 ⇌ 2A is correctly given by Kc = [A]^2/[A2], as it follows the law of mass action where the concentration of products is raised to their stoichiometric coefficients and divided by the concentration of reactants raised to their coefficients.

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