Chemistry - Thermochemistry Question with Solution | TestHub

Given
$\mathrm{F}(\mathrm{g})+{\mathrm{e}}^{-}\to {\mathrm{F}}^{-}(\mathrm{g})$ (Electron gain enthalpy) ${\mathrm{Li}}^{+}(\mathrm{g})+{\mathrm{F}}^{-}(\mathrm{g})\to \mathrm{LiF}(\mathrm{s})-1047$ $\mathrm{Li}(\mathrm{s})+\frac{1}{2}{\mathrm{F}}_2(\mathrm{g})\to \mathrm{LiF}(\mathrm{s})-617$ Based on data provided, the value of electron gain enthalpy of fluorine would be: