8.3 Bond Enthalpy

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Bond Enthalpy (a.k.a. Bond Energy)

Bond breaking is endothermic.

Bond making is exothermic.

ΔH°rxn = ∑Dreactants - ∑Dproducts = ∑Dbroken - ∑Dformed

N2H4(g) + O2(g) → N2(g) + 2H2O(g)      ΔH = ?

Bond Enthalpies (kJ/mol)
N–H 391
O–H 463
O=O 495
N–N 163
N≡N 941