Chemistry 9th Edition

by Zumdahl, Steven S.; Zumdahl, Susan A.

Published by Cengage Learning

ISBN 10: 1133611095

ISBN 13: 978-1-13361-109-7

Chapter 6 - Thermochemistry - Exercises - Page 287: 49

Answer

2.5 kJ/mol represents PV work or change in volume as the reaction involves a change from liquid to gas.

Work Step by Step

Note that $\Delta H = \Delta E +P\Delta V$. Therefore, the 2.5 kJ/mol represents the change in volume from the liquid phase to a gas phase.

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