Chemistry: The Central Science (13th Edition)

by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.

Published by Prentice Hall

ISBN 10: 0321910419

ISBN 13: 978-0-32191-041-7

Chapter 5 - Thermochemistry - Exercises - Page 205: 5.27a

Answer

Case 2 because energy is not used for expansion work.

Work Step by Step

In case 1, the gas moves the piston and does work on the surroundings. However, in case 2 the gas does no work on the surroundings and therefore has a greater change in energy.

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