Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 1 - Intermolecular Forces and Liquids and Solids - Questions & Problems - Page 510: 11.17


a) NH$_{3}$ - higher dispersion forces, dipole moment b) KCl - dipole moment

Work Step by Step

a) NH$_{3}$ requires more heat to break its stronger intermolecular forces because of its higher dispersion forces due to its larger electron cloud. In addition, it also has a dipole moment that allows stronger dipole-dipole interactions. b) KCl, as an ionic compound, is highly polar, and compared to the very nonpolar I$_{2}$, will require more energy to break its dipole-dipole forces.
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