Question: A heat engine that operates on a Carnot cycle uses a lowtemperature reservoir at (25^{circ} mathrm{C}) and runs at an efficiency of 0. 350 .

A heat engine that operates on a Carnot cycle uses a lowtemperature reservoir at $25^{\circ} \mathrm{C}$ and runs at an efficiency of 0. 350 . The working substance is nitrogen gas, and the gas chamber contains $7.50 \times 10^{23} \mathrm{~N}_{2}$ molecules. What is the change in the thermal energy of the $\mathrm{N}_{2}$ gas between its lowest and highest temperatures?

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