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For the equilibrium process N2O4(g) ⇌ 2NO2(g), the equilibrium concentrations of N2O4 and NO2 are 4.8 × 10−2 mol L−1 and 1.2 × 10−2 mol L−1, respectively. What is the value of Kc for this reaction?

1. 3 × 10−1 mol L−1
2. 3 × 10−3 mol L−1
3. 3 × 10³ mol L−1
4. 3.3 × 10² mol L−1

Correct answer: 3 × 10−3 mol L−1

Solution

The equilibrium constant Kc is calculated using the formula Kc = [NO2]² / [N2O4]. Substituting the given concentrations, Kc = (1.2 × 10−2)² / (4.8 × 10−2) results in a value of 3 × 10−3 mol L−1, confirming option B as correct.

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