Use the Following Standard Enthalpies of Atom Combination To $\Delta$ H_ac° H₂(g) = -435

Use the following standard enthalpies of atom combination to
$\Delta$ H_ac° H₂(g) = -435.30 kJ/mol_rxn   $\Delta$ H_ac F₂(g) = -157.98 kJ/mol_rxn
$\Delta$ H_ac° N₂(g) = -945.41 kJ/mol_rxn   $\Delta$ H_ac° C(s) = -716.68 kJ/mol_rxn
$\Delta$ H_ac° O₂(g) = -498.34 kJ/mol_rxn   $\Delta$ H_ac° NH₃(g) = -1171.8 kJ/mol_rxn
$\Delta$ H_ac° H₂O(g) = -926.3 kJ/mol_rxn   $\Delta$ H_ac° HF(g) = -567.7 kJ/mol_rxn
-What is the bond energy, H₂N-H, for one of the N-H bonds in NH₃(g) ?

A) 391 kJ/mol
B) 645 kJ/mol
C) 737 kJ/mol
D) 846 kJ/mol
E) 1173 kJ/moI