posted by Bran .
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.