Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 5 - Section 5.6 - Standard Enthalpies of Formation - Checkpoint - Page 215: 5.6.1


b) -543.2 kJ/mol

Work Step by Step

$\Delta H_{rxn}^{\circ}=$$2\times \Delta H_{f}^{\circ}(HF)-[\Delta H_{f}^{\circ}(H_{2})+\Delta H_{f}^{\circ}(F_{2})]$ $=(2\times-271.6\,kJ/mol)-(0+0)$ $=-543.2\,kJ/mol$
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