(a) How much heat transfer occurs from 20.0 kg of 90.0 C water placed in contact with
Chapter 15, Problem 56(choose chapter or problem)
(a) How much heat transfer occurs from 20.0 kg of 90.0 C water placed in contact with 20.0 kg of 10.0 C water, producing a final temperature of 50.0 C ? (b) How much work could a Carnot engine do with this heat transfer, assuming it operates between two reservoirs at constant temperatures of 90.0 C and 10.0 C ? (c) What increase in entropy is produced by mixing 20.0 kg of 90.0 C water with 20.0 kg of 10.0 C water? (d) Calculate the amount of work made unavailable by this mixing using a low temperature of 10.0 C , and compare it with the work done by the Carnot engine. Explicitly show how you follow the steps in the Problem-Solving Strategies for Entropy. (e) Discuss how everyday processes make increasingly more energy unavailable to do work, as implied by this problem.
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