Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 5 - Questions and Problems: 5.14

Answer

-41 J.

Work Step by Step

Given, $\Delta U$= -128 J. q = -87 J ( negative because heat is released) We know, $\Delta U$ = q+w. -128 J = -87 J + w. Which gives w = -128 J+ 87 J = -41 J.
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