1st Edition

ISBN: 9781938168000

Author: Paul Peter Urone, Roger Hinrichs

Publisher: OpenStax College

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Chapter 15, Problem 56PE

(a) How much heat transfer occurs from 20.0 kg of 9 0.0 ° C water placed in contact with 20.0 kg of 1 0.0 ° C water, producing a final temperature of 5 0.0 ° C ? (b) How much work could a Carnot engine do with this heat transfer, assuming it operates between two reservoirs at constant temperatures of 9 0.0 ° C and 1 0.0 ° C ? (c) What increase in entropy is produced by mixing 20.0 kg of 9 0.0 ° C water with 20.0 kg of 1 0.0 ° C water? (d) Calculate the amount of work made unavailable by this mixing using a low temperature of 1 0.0 ° C , and compare it with the work done by the Garnet 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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Chapter 15, Problem 55PE

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