# Question #96d01

Zinc nitrate, $\text{Zn(NO"_3)_2}$, is an ionic compound. Ionic compounds do not form molecules. Ionic compounds exist as crystal lattices. The lowest whole number ratio, also the empirical formula, represents a formula unit. The expression $\text{5 Zn(NO"_3)_2}$ represents 5 formula units or 5 moles of zinc nitrate.