If the standard electromotive force of a galvanic cell (E°cell) is +0.591 V at 298 K for a two-electron transfer process (n = 2), what is the value of the equilibrium constant (Kc) for the cell reaction?
Answer and explanation
Correct answer: D. 10^20
- Step 1: At equilibrium, the cell potential becomes zero ().
- Step 2: The Nernst equation gives: .
- Step 3: Rearranging for : .
- Step 4: Substitute and : .
- Step 5: Therefore, .
Answer
10^20
Why not the others: '10^10' forgets to multiply by ; '10^2' divides by 10 instead of computing the logarithm exponent; '10^40' erroneously squares the exponent.
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