What is the efficiency of an ideal heat engine working between the freezing point and boiling point of water ?

26.8 % 20 % 12.5 % 6.25 %

26.8 %

Efficiency of heat engine : \(\eta = (1 - \frac{T_2}{T_1})\) T2 : Sink Temperature = 0oC = 273 K ; T1 : Source Temperature = 100oC = 373 K ; \(\eta = (1 - \frac{273}{373})\) \(\eta = 26.8%\)