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Question:

The efficiency of fuel cell is given by the expression, η is:

η=−nFEcellΔA×100

η=−nFEcellΔH×100

η=−nFEcellΔS×100

None of the above

Solution:

Efficiency of fuel cell is η=−nFEcellΔH×100. The thermodynamic efficiency of the fuel cell is the ratio of the electrical free energy to the enthalpy change of the reaction. η=ΔGΔH×100 Also, ΔG=−nFEcell Hence, option B is correct.