A reversible cyclic heat engine is used to cool an aluminum block having a mass of 5 kg, from 40°C to 20°C by reversibly transferring heat from it. The room air, which is at 20°C serves as a constant temperature sink for the engine. What is the change in entropy for the block and for the room air? Also calculate the work done by the engine. Assume for aluminum Cp= 400 J/kgK.

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