First and second ionization enthalpies of lithium are 520 kJ mol^-1 and 7297 kJ mol^-1 respectively. Energy required to convert 3.5 mg lithium (g)…

First and second ionization enthalpies of lithium are $\displaystyle 520 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\displaystyle 7297 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. Energy required to convert $\displaystyle 3.5$ mg lithium (g) into $\displaystyle \mathrm{Li}^{2+}(\mathrm{g})\left[\mathrm{Li}(\mathrm{g}) \rightarrow \mathrm{Li}^{2+}(\mathrm{g})\right]$ is $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{kJ} \mathrm{mol}^{-1}$. (nearest integer) [Molar mass of $\displaystyle \mathrm{Li}=7 \mathrm{~g} \mathrm{~mol}^{-1}$ ]