Appendix 9: Table of bond energies

Precise bond energies in diatomic molecules

Bond	Bond energy	Bond	Bond energy	Bond	Bond energy
H-H	436.0	H-F	569.9	F-F	158.8
O=O	498.4	H-Cl	431.6	Cl-Cl	242.6
N $\equiv$ N	945.3	H-Br	366.4	Br-Br	192.8
C $\equiv$ O	1076.5	H-I	298.4	I-I	151.1
C=C	607	Si-Si	326.8	C-Si	451.5

Average bond energies in polyatomic molecules

Bond	Bond energy	Bond	Bond energy	Bond	Bond energy
C-H	414	C-F	441	O-H	464
C-C	347	C-Cl	326	O-O	146
C=C	599	C-Br	276	N-H	389
C $\equiv$ C	829	C-I	240	N-N	263
C-N	285	Si-H	393	N-Cl	201
C $\equiv$ N	866	Si-Si	340	P-H	318
C-O	335	Si-O	450	PCl	318
C=O (in CO₂)	804	Si-Cl	380	S-S	264
C=O(organic)	700			S-H	340

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