The reaction you want to end up with after adding the two reactions together is
Li+ (g) + F�?/SUP> (g) ––�?gt; Li (g) + F (g)
Try again! Does your textbook have some examples that you can examine? That would help. You can't usually just add the reactions together as they are given. You have to reverse some, or multiply some through by some number, etc., before adding them together, or you won't get the correct desired reaction.
For the PF3 question, you just have to draw the correct dot structure, with octets of electrons around all of the atoms.
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