200 g of 80 C water is left to cool down to room temperature (25 C). (a) Determine the entropy change of the water. (b) Determine the entropy change of the air around by assuming that the air has constant temperature of 25 C at all time. (i.e. an isothermal process) (c) What is the total change of the entropy water + air? (d) What does the value is part (c) is telling in the light of the 2nd law of thermodynamics?

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