Chemistry 12th Edition

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

Chapter 11 - Intermolecular Forces and Liquids and Solids - Questions & Problems - Page 511: 11.65

Answer

The statement is false. Molar heat of vaporization is defined as the amount of heat which is required to vaporize one mole of a liquid to a gas. For vaporization of a liquid, breaking the intermolecular attractive forces present in the liquid phase is required. Thus, weaker attractive force in liquid means that less energy is required to overcome this attractive force; that means molar heat of vaporization of the liquid is low. If molecules have weaker intermolecular forces, then they have higher vapor pressure. Thus, higher vapor pressure implies a lower heat of vaporization.

Work Step by Step

The statement is false. Molar heat of vaporization is defined as the amount of heat which is required to vaporize one mole of a liquid to a gas. For vaporization of a liquid, breaking the intermolecular attractive forces present in the liquid phase is required. Thus, weaker attractive force in liquid means that less energy is required to overcome this attractive force; that means molar heat of vaporization of the liquid is low. If molecules have weaker intermolecular forces, then they have higher vapor pressure. Thus, higher vapor pressure implies a lower heat of vaporization.
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