When 0560 G of Na(s)reacts with Excess F₂(g)to Form NaF(s), 13

question 74

Multiple Choice

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 ( $\Delta$ H°_f) of NaF(s) ?

• A)-570 kJ/mol
• B)-24.8 kJ/mol
• C)-7.8 kJ/mol
• D)24.8 kJ/mol
• E)570 kJ/mol

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