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E° for the cell, Zn|Zn2+ (aq)||Cu2+ (aq)|Cu at 25°C is 1.10 V. The equilibrium constant for the cell reaction is of the order of

1. 10^-18
2. 10^-37
3. 10^18
4. 10^37

Correct answer: 10^18

Solution

The relationship between E°cell and the equilibrium constant (K) is given by the Nernst equation: E°cell = (0.0591/n) log K at 25°C. For this cell, n = 2. Substituting E°cell = 1.10 V, we find log K ≈ 18, so K ≈ 10^18.

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