# Chapter 9 - Exercises - Page 421: 45

The lattice energy of $BaO$ is much higher because the charge on its ions is higher.

#### Work Step by Step

An important factor in the magnitude of lattice energy is the product of the charges on the ions of the compound. In $BaO$, the cation and anion have a charge of 2 each, while in $CsF$, the cation and anion have a charge of 1 each. The product of the charges in BaO is 4 times of that in CsF. So, the lattice energy of $BaO$ is nearly 4 times that of $CsF$.

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