Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 6 - Thermochemistry - Exercises - Page 289: 73


$-233\text{ kJ}$

Work Step by Step

We combine the following reactions: $NO_{(g)}+O_{3(g)}\Rightarrow NO_{2(g)}+O_{2(g)}\text{ -199 kJ}$ $O_{(g)}\Rightarrow \frac{1}{2}O_{2(g)}\text{ -247.5 kJ}$ $\frac{3}{2}O_{2(g)}\Rightarrow O_{3(g)}\text{ 213.5 kJ}$ Therefore, the enthalpy of the reaction is: $\Delta H = -199 -247.5+213.5=-233\text{ kJ}$
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