Standard Bond Energies

Single Bonds

ΔHº*

 

Single Bonds

ΔHº*

 

Multiple Bonds

ΔHº*

H-H

104.2

B-F

150

C=C

146

C-C

83

B-O

125

N=N

109

N-N

38.4

C-N

73

O=O

119

O-O

35

N-CO

86

C=N

147

F-F

36.6

C-O

85.5

C=O (CO2)

192

Si-Si

52

O-CO

110

C=O (aldehyde)

177

P-P

50

C-S

65

C=O (ketone)

178

S-S

54

C-F

116

C=O (ester)

179

Cl-Cl

58

C-Cl

81

C=O (amide)

179

Br-Br

46

C-Br

68

C=O (halide)

177

I-I

36.

C-I

51

C=S (CS2)

138

H-C

99

C-B

90

N=O (HONO2)

143

H-N

93

C-Si

83

P=O (POCl3)

110

H-O

111

C-P

70

P=S (PSCl3)

70

H-F

135

N-O

55

S=O (SO2)

128

H-Cl

103

S-O

87

S=O (DMSO)

93

H-Br

87.5

Si-F

135

P=P

84

H-I

71

Si-Cl

90

P@P

117

H-B

90

Si-O

110

C@O

258

H-S

81

P-Cl

79

C@C

200

H-Si

75

P-Br

65

N@N

226

H-P

77

P-O

90

C@N

213

* In kcal per mole