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 204: 5.26b

Answer

$\Delta E = +322 J$ Endothermic

Work Step by Step

The bar of gold absorbs 322J of heat. Since it is absorbing heat, heat is entering the system, so it is positive. This means that q = + 322J. Since $\Delta E = q + w$ then we have $\Delta E = +322J + 0 = 322 J $ Since this is positive, it means it is endothermic

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