Chemistry: The Molecular Science (5th Edition)

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

Chapter 16 - Thermodynamics: Directionality of Chemical Reactions - Conceptual Exercise 16.4 - Predicting Entropy Changes - Page 705: b

Answer

Entropy increases because the change is from solid-state to aqueous state in which ions can move freely among water molecules.

Work Step by Step

Entropy increases when a pure solid dissolves in a solvent. Therefore, when NaCl is changed from solid-state to aqueous state, entropy is expected to increase.
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