What is the energy (in J atom ^-1 ) required for the following process? Li^2+( g ) → Li^3+( g )+ e^- (Take the ionization energy for the H atom in…

What is the energy (in J atom $\displaystyle { }^{-1}$ ) required for the following process? $$\mathrm{Li}^{2+}(\mathrm{g}) \rightarrow \mathrm{Li}^{3+}(\mathrm{g})+\mathrm{e}^{-} $$ (Take the ionization energy for the H atom in the ground state as $\displaystyle 2.18 \times 10^{-18} \mathrm{~J}$ atom $\displaystyle ^{-1}$ )