STEP-BY-STEP EXPLANATION:
What to find? How many formula units are present in 0.354 moles
Given parameters
Mole of copper (II) chloride = 0.354 mole
Avogadro's number = 6.023 * 10^23
To find how many formula units, we will be using the formula below
[tex]\begin{gathered} \text{ Formular unit = moles }\cdot\text{ Avogadro's number} \\ \text{Formular unit = 0.354 }\cdot\text{ 6.023 }\cdot10^{23} \\ \text{Formula un}it\text{ = }2.13\cdot10^{23}\text{ formula units} \end{gathered}[/tex]