When 0560 G of Na(s) Reacts with Excess F₂(g) to Form

When 0.560 g of Na(s) reacts with excess F₂(g) to form NaF(s) , 13.8 kJ of heat is evolved at standard-state conditions. What is the standard enthalpy of formation (ΔH°_f) of NaF(s) ?

A) 567 kJ/mol
B) -24.8 kJ/mol
C) -7.8 kJ/mol
D) 24.8 kJ/mol
E) -567 kJ/mol