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(a) A quantity of water, initially at 10oC, is brought into contact with a hear reservoir at a temperature of 90oC. What is the entropy change of the entire system when the water reaches the temperature of bath?
(b) What is the entropy change of the entire system if we use two reservoirs to heat the water first from 10 to 50oC, and then from 50 to 90oC?
(c) Can you suggest how, in principle, water might be heated from an initial temperature Ti to a final temperature Tf with no change in global entropy?
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