Answer
B
Work Step by Step
Since the negative of the enthalpy of hydration is inversely proportional to ionic radius, $Al^{3+}$ will have a more negative enthalpy due to the smaller radius.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 11 Intermolecular Forces and Liquids - 11-2 Interactions between Ions and Molecules with a Permanent Dipole - Review & Check for Section 11-2 - Page 409: 1
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