Question

Which of the following molecule has higher lattice energy?

• A. NaCl.
• B. $M{g}_1{N}_3$.
• C. Both (A) and (B) have equal lattice energy.
• D. None of these

Answer 1

Answer: (B)

$M{g}_1{N}_3$.

Lattice energy of a crystal is defined as the energy required to break an ionic crystal into its constituent ions in an isolated gaseous state. More ionic the compound is stronger will be its ionic bond and higher will be its lattice energy.

In $Mg{N}_3$ the charge on the ionic species is greater than $NaCl$. So, ionic interactions in $Mg{N}_3$ will be stronger.

So, lattice energy of $Mg{N}_3$ is greater than $NaCl$