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What is the maximum theoretical energy efficiency of a fuel cell?(a) 100%(b) 69%(c) 50%(d) 83%I have been asked this question in a national level competition.Enquiry is from Electrochemistry in chapter Electrochemistry of Chemistry – Class 12

Answer» RIGHT option is (d) 83%

The BEST explanation: E°cell of an H2-O2 FUEL cell = 1.23 V and ΔH=-285.8 kJ mol^-1

ΔG = -N x F x E°cell = -2 x 96500 x 1.23

= -237390 J mol^-1

= -237.390 kJ mol^-1

Efficiency = ΔG/ΔH x 100

= -237.390/-285.8 x 100

= 83%.


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