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

question 86

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 ^$\circ$ _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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