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! 
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