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For the reaction A2 + B2 ⇌ 2AB, Kc = [AB]^2 / [A2][B2]. Calculate Kc for the given concentrations: [A2] = 3 × 10^-3, [B2] = 4.2 × 10^-3, [AB] = 2.8 × 10^-3.

1. 2.8 × 10^-3
2. 3 × 10^-3 × 4.2 × 10^-3
3. 0.62
4. 3 × 4.2

Correct answer: 0.62

Solution

Using the formula Kc = [AB]^2 / ([A2][B2]), substitute the given values: Kc = (2.8 × 10^-3)^2 / (3 × 10^-3 × 4.2 × 10^-3). Simplifying, Kc = 7.84 × 10^-6 / 12.6 × 10^-6 = 0.62.

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