Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 6 - Sections 6.1-6.10 - Exercises - Review Questions: 26

Answer

Hess's law states that if a chemcial equation can be expressed as the sum of a series of steps, then $\Delta$$H$ for the overall equation is the sum of the heats of reactions for each step.

Work Step by Step

It is useful because it allows us to determine $\Delta$$H$ for a reaction without directly measuring it in the lab.
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