Please Help!!! Balance the following chemical equation by typing the coefficients in the drop-down boxes for the reactants and products. (Reactants are on the top line; products are on bottom line.)
[ Select ] NaBr + [ Select ] CaF2 --> [ Select ] NaF + [ Select ] CaBr2

the answer is true.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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