Table 2.

Average bond enthalpies.

Bond	ΔH at 298 K kJ/mol	ΔH Ergs Per Molecule ×1012	Zero Point Vibrational Energy cm−1	Characteristic Temperature Rotation Θrot K	Characteristic Temperature Vibration Θvib K
H-H = H2	436	7.19234576	2079.307	85.4	6210
C-H = CH4	413	6.81293303
N-H = NH3	391	6.45001650	7214.5
O-H = H2O	463	7.01302636
C=O = CO2	745	11.2844953		0.561
C-O-	358	5.42259921
C-N=	305	4.61981217
O-O-	146	2.21145108
O=O = O2	498	7.54316874	787.3797	2.07	2230
O-N=	201	3.04453196
N=N-	418	6.33141472
N2	945	14.3138443	1175.778	2.86	3374
N=O	607	9.19418358