Answer
$NaF(s)$
Work Step by Step
Both are ionic solids having similar formulas. The larger standard molar entropy is for $NaF(s)$ as the attraction of ions is weaker in $NaF(s)$ than $MgO(s)$.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 18 - Thermodynamics: Directionality of Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 737b: 26c
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