Chemistry: The Central Science (13th Edition)

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

Chapter 5 - Thermochemistry - Exercises: 5.62a

Answer

$\Delta H = +90kJ$

Work Step by Step

The Hess's law states that, if a reaction have two or more steps, like the one in the problem: $A --> B$ $ :\Delta H = + 30kJ$ $B --> C $ $ : \Delta H = +60kJ$ The entropy can be calculated by the sum of the two steps involved. $\Delta H : A --> C = (+30kJ) + (+60kJ) = +90kJ$
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