InterviewSolution
Saved Bookmarks
| 1. |
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%. |
|