The Standard Molar Enthalpy of Formation of NH₃(g) Is -45

Multiple Choice

The standard molar enthalpy of formation of NH₃(g) is -45.9 kJ/mol. What is the enthalpy change if 9.51 g N₂(g) and 1.96 g H₂(g) react to produce NH₃(g) ?

A) -10.3 kJ/mol-rxn
B) -20.7 kJ/mol-rxn
C) -29.8 kJ/mol-rxn
D) -43.7 kJ/mol-rxn
E) -65.6 kJ/mol-rxn