# Question 57163

$4.5 \times {10}^{24}$ $\text{ions}$
Based on the chemical formula, you know that each formula unit of "Cu"("NO"_3)2# will dissociate into 3 ions when dissolved in water (one ${\text{Cu}}^{2 +}$ ion and two ${\text{NO}}_{3}^{-}$ ions). The polyatomic ion does not dissociate.
So if we multiply $2.5 \times 3$ we get $7.5$ moles of ions. Then, multiply by Avogadro’s constant, $6.02 x {10}^{23}$, and we get the final result $4.5 \times {10}^{24}$ ions.