Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 9 - Sections 9.1-9.11 - Exercises - Problems by Topic: 45

Answer

This large difference is because $BaO$ has a much higher ion charge than $CsF$.

Work Step by Step

Lattice energy depends on the product of ion charges. $BaO$ is made up of $Ba^{2+}$ and $O^{2-}$ ions, and has the product of ion charges = -4. $CsF$ is made up of $Cs^+$ and $F^-$ ions, and its product of ionic charges is -1, which is four times less than that of $BaO$. So, its lattice energy is also around 4 times less than of $BaO$
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