Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 4 - Energy and Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 189e: 81b



Work Step by Step

$\Delta H^{\circ}=\Sigma n_{p}\Delta H_{f}^{\circ}(products)-\Sigma n_{r}\Delta H_{f}^{\circ}(reactants)$ $=[2\Delta H_{f}^{\circ}(HF,g)+\Delta H_{f}^{\circ}(I_{2},s)]-[2\Delta H_{f}^{\circ}(HI,g)+\Delta H_{f}^{\circ}(F_{2},g)]$ $=[2(-271.1\,kJ/mol)+(0\,kJ/mol)]-[2(26.48\,kJ/mol)+(0\,kJ/mol)]$ $=-595.2\,kJ/mol$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.