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Na (s) + 1/2F2 (g) = 2NaF (s)
Are the reactants at higher or lower energy than the products and is the reaction endothermic or exothermic?
I feel that the reaction is exothermic, but can't determine higher or lower enery?


    Have you talked in class about delta H formation. I would look up dHf NaF to find that it is indeed an exothermic reaction. The products are at a lower energy than the reactants.

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