This page has tables of standard bond energies and bond dissociation energies.

Standard Bond Energies

Single Bonds

ΔH*

 

Single Bonds

ΔH*

 

Multiple Bonds

ΔH*

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 (HONO)

143

H–N

93

C–Si

76

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

* Average Bond Dissociation Enthalpies in kcal per mole
  (There can be considerable variability in some of these values.)

 

Organic Chemistry
Michigan State University

 



Bond Dissociation Energies*

atom or
group

methyl

ethyl

i-propyl

t-butyl

phenyl

benzyl

allyl

acetyl

vinyl

H

103

98

95

93

110

85

88

87

112

F

110

110

109

 

124

94

 

119

 

Cl

85

82

81

80

95

68

70

82

90

Br

71

70

69

66

79

55

56

68

80

I

57

54

54

51

64

40

42

51

 

OH

93

94

92

91

111

79

82

107

 

NH2

87

87

86

85

104

72

75

95

 

CN

116

114

112

 

128

100

   

128

CH3

88

85

84

81

101

73

75

81

98

C2H5

85

82

81

78

99

71

72

78

95

(CH3)2CH

84

81

79

74

97

70

71

76

93

(CH3)3C

81

78

74

68

94

67

67

 

89

C6H5

101

99

97

94

110

83

87

93

108

C6H5CH2

73

71

70

67

83

59

59

63

81

* In kcal per mole

   

Organic Chemistry
Michigan State University

 

Many of the bond energies listed here were taken from the following sources:
R.T.Sanderson, Polar Covalence, 1983
R.T.Sanderson, Chemical Bonds and Bond Energy, 1976