Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 5 - Thermochemistry - Exercises - Page 204: 5.12a

Answer

A _______________________ | V _______________________ B
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Work Step by Step

In an enthalpy diagram, the reactants go on the top and the products go on the bottom. Since this particular diagram assumes that A --> B is exothermic, we see that the arrow goes down from the reactant to the product. (See diagram image file for a better representation)
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