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Imagine that one mole of liquid water at 100C serves as the warm reservoir of a (small) Carnot engine. As heat is drawn from this reservoir by the engine, the temperature of this reservoir drops. Calculate the amount of work that can be obtained from this reservoir before it cools to the temperature of the cold reservoir which is 0C. Assume that the heat capacity of water is constant over this temperature range at 75 J/(mole*K). Calculate the efficiency of this process.

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