The total number of moles of ions required for the formation of one mole of ${\mathrm{MgCl}}_2$ is__________

${\mathrm{MgCl}}_2$ is the chemical formula for magnesium chloride. It is composed of ${\mathrm{Mg}}^{2+}$ and ${\mathrm{Cl}}^{-}$ ions. When one mole of ${\mathrm{MgCl}}_{2 }$dissociates in solution, we get one mole of ${\mathrm{Mg}}^{2+}$ ions and two moles of$C{l}^{-}$ ions, for a total of three moles of ions.
${\mathrm{MgCl}}_2\left(\mathrm{s}\right)\stackrel{{\mathrm{H}}_2\mathrm{O}}{⟶}{\mathrm{Mg}}^{2+}+2{\mathrm{Cl}}^{-}$
Hence, the required answer is 3