Answer
Please see the work below.
Work Step by Step
We know that $Al^{+3}$ ion has both greater charge and a smaller ionic radius as compared to $Mg^{+2}$, hence $Al^{+3}$ should have greater hydration energy.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 12 - Solutions - Questions and Problems - Page 528: 12.43
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