This is another Hess's law problem. The first of the given reactions is incorrect. Here are both of them again:
Li (g) ––�?gt; Li+ (g) + e�?/SUP> ΔH = +520kJ/mol
F (g) + e�?/SUP> ––�?gt; F�?/SUP> (g) ΔH = �?28kJ/mol
This question is very easy �?review the Hess's law section in your textbook and give it a try. (I remember you were having trouble with this topic before, so now's as good of time as any to figure it out! )