Bond energy

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Bond ΔH298

(kcal.mol-1)

ΔH298 Bond ΔH298 ΔH298
(kJ.mol-1) (kcal.mol-1) (kJ.mol-1)
Inorganics
H-H 104.2 436 H-OH 118.8 497.1
H-F 136.3 570.3 H-SH 91.2 381.6
H-Cl 103.2 431.8 H-NO 49.5 207.1
H-Br 87.5 366.1 H-ONO (trans) 79.1 331
H-I 71.3 298.3 H-ONO2 101.7 425.5
H-CN 126.3 528.4 H-SiH3 91.7 383.7
H-NH2 107.6 450.2 H-GeH3 83 347
Hydrocarbons
CH3-H 105 439.3 C6H5-H 112.9 472.4
CH3CH2-H 101.1 423 C6H5CH2-H 89.8 375.7
(CH3)2CH-H 98.6 412.5 C5H5-H 79.9 334.3
CH3CH2(CH3)CH-H 98.2 410.9 c-C3H5-H 105.7 442.2
(CH3)3C-H 96.5 403.8 c-C4H7-H 95.6 400
CH2CH-H 110.7 463.2 c-C5H9-H 93 389.1
CH2CHCH2-H 88.8 371.5 c-C6H11-H 95.6 400
(CH2CH)2CH-H 76.4 319.7 c-C7H13-H 93.4 390.8
HCC-H 133.3 557.7
Halides
H-CH2F 101.3 423.8 H-CF3 106.7 446.4
H-CH2Cl 99.5 416.3 H-CCl3 95.8 400.8
H-CH2Br 101.6 425.1 H-CBr3 96 401.7
Alcohols
CH3O-H 104.6 437.6 (CH3)2CHO-H 105.7 442.2
H-CH2OH 96.1 402.1 (CH3)3CO-H 106.3 444.8
CH3CH2O-H 104.7 438.1 C6H5O-H 90 377
Peroxides
HOO-H 87.8 367.4 CH3CH2OO-H 85 356
CH3OO-H 88 368 (CH3)3COO-H 84 351
Carbonyls
HC(O)-H 88.1 368.6 HCOO-H 112 469
CH3C(O)-H 89.4 374 H-COOH ≥96 402
H-CH2CHO 94 393 CH3COO-H 112 469
C6H5C(O)-H 88.9 372 H-CH2COOH 96 402
C6H5COO-H 111 464
Other
CH3S-H 87.4 365.7 H-CH2NH2 92.2 385.8
H-CH2SH 94 393 H-CH2CN 93.4 390.8
H-CH2SO2Me 99 414.2
Single Bonds ΔH°*
H–H 104.2
C–C 83
N–N 38.4
O–O 35
F–F 36.6
Si–Si 52
P–P 50
S–S 54
Cl–Cl 58
Br–Br 46
I–I 36
H–C 99
H–N 93
H–O 111
H–F 135
H–Cl 103
H–Br 87.5
H–I 71
H–B 90
H–S 81
H–Si 75
H–P 77
B–F 150
B–O 125
C–N 73
N–CO 86
C–O 85.5
O–CO 110
C–S 65
C–F 116
C–Cl 81
C–Br 68
C–I 51
C–B 90
C–Si 76
C–P 70
N–O 55
S–O 87
Si–F 135
Si–Cl 90
Si–O 110
P–Cl 79
P–Br 65
P–O 90
Multiple Bonds ΔH°*
C=C 146
N=N 109
O=O 119
C=N 147
C=O (CO2) 192
C=O (aldehyde) 177
C=O (ketone) 178
C=O (ester) 179
C=O (amide) 179
C=O (halide) 177
C=S (CS2) 138
N=O (HONO) 143
P=O (POCl3) 110
P=S (PSCl3) 70
S=O (SO2) 128
S=O (DMSO) 93
P=P 84
P≡P 117
C≡O 258
C≡C 200
N≡N 226
C≡N 213

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