Chemistry - Mole Concept Question with Solution | TestHub

Molar mass of ${\mathrm{CaCl}}_2=40+2\times 35.5=111\text{ g/mol}$

Number of moles of ${\mathrm{CaCl}}_2=\frac{222}{111}=2\text{ moles}$

One molecule of ${\mathrm{CaCl}}_2$ dissociates to give 2 ${\mathrm{Cl}}^{-}$ ions.

Number of moles of ${\mathrm{Cl}}^{-}$ ions = $2\times 2=4\text{ moles}$

Number of ${\mathrm{Cl}}^{-}$ ions = $4{\mathrm{N}}_{\mathrm{A}}$

Answer: $4{\mathrm{N}}_{\mathrm{A}}$