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The efficiency of a fuel cell is given by

1. ΔG / ΔS
2. ΔG / ΔH
3. ΔS / ΔH
4. ΔH / ΔG

Correct answer: ΔG / ΔH

Solution

The efficiency of a fuel cell is defined as the ratio of Gibbs free energy change (ΔG) to the enthalpy change (ΔH), as it measures the useful work output relative to the total energy change.

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