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A cell reaction involving transfer of a single electron has a standard emf of 0.591 V at 25°C. What is the equilibrium constant for this reaction? (F = 96,500 C mol−1; R = 8.314 J K−1 mol−1)

1. 1.0 × 10¹⁰
2. 1.0 × 10⁵
3. 1.0 × 10¹
4. 1.0 × 10³⁰

Correct answer: 1.0 × 10¹⁰

Solution

The equilibrium constant can be calculated using the Nernst equation, which relates the standard emf to the equilibrium constant. A standard emf of 0.591 V indicates a strong driving force for the reaction, leading to a large equilibrium constant, specifically 1.0 × 10¹⁰, indicating that the products are favored at equilibrium.

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