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: 25

Answer

(a) If a chemical equation is multiplied by some factor, then $\Delta$$H$ is also multiplied by the same factor. (a) If a chemcial equation is reversed, $\Delta$$H$ also changes sign.

Work Step by Step

These relationships hold because enthalpy is a state function. Twice as much energy is transferred in twice the quantity of reactants and products. Reversing a reaction switches the initial and final states, which means the direction of heat flow is reversed.
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