Table shows energy of common chemical bonds in selected unit (kJ/mol, atomic units, eV etc.).

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Bond energy#

Bond	Bond energy [kJ/mol]	Notes
Al-C	255	-
S-Br	218	-
As-As	146	-
S-Cl	255	-
As-Cl	298	-
S-F	284	-
As-I	180	-
Cl-O	251	-
As-O	355	-
Cs-H	176	-
B-Br	377	-
H-As	247	-
B-C	372	-
H-B	389	-
B-Cl	456	-
H-Br	366	-
B-F	644	-
H-C	415	-
B-N	444	-
H-C	427	benzene
B-O	536	-
H-C	435	alkens
Be-Cl	456	-
H-Cl	431	-
Be-I	289	-
H-F	566	-
Be-Br	193	-
H-H	436	-
Be-O	201	-
H-I	298	-
C-As	201	-
H-Li	243	-
C-Br	284	-
H-N	389	-
C-C	347	-
H-O	465	-
C-C	487	benzene
H-P	322	-
C=C	568	graphite
H-S	347	-
C=C	611	-
H-Se	276	-
C≡C	837	-
H-Te	238	-
C-Cl	339	-
F-F	159	-
C-F	485	-
I-F	264	-
C-I	213	-
I-I	151	-
C-N	305	-
I-O	201	-
C=N	615	-
Li-Li	105	-
C≡N	891	-
N-Cl	192	-
C-O	360	-
N-F	272	-
C=O	741	-
N-N	54	N₂O₄
C=O	1075	CO
N-N	163	-
C-P	264	-
N=N	418	-
C-S	272	-
N-O	468	NO₂, N₂O₄, N₂O₅
C=S	536	-
N=O	631	NO
Cl-Cl	242	-
N=O	439	nitro compounds
N-O	168	N₂O
S=O	460	-
Na-H	201	-
S-O	226	-
O-F	188	-
S=S	418	-
O-O	146	-
Se-Se	172	-
O=O	499	-
Si-Br	310	-
P-Br	264	-
Si-C	301	-
P-Cl	326	-
Si-Cl	381	-
P-F	490	-
Si-F	565	-
P-I	184	-
Si-H	318	-
P-O	335	-
Si-I	234	-
P-P	201	-
Si-O	488	-
P=P	490	-
Si-Si	222	-
Pb-C	130	-
U-F	515	-

Some facts#

Chemical bond energy is the amount of work that should be done to separate the molecule AB into single atoms to the distance of infinity.
The energy of chemical bonding is given most often in kilojoules per mole :

$\dfrac{kJ}{mol}$
Knowing the energies of bonds present in products and substrates, we can estimate the enthalpy of the chemical reaction:

$\Delta h = \sum{n_{prod,i} H_{prod,i}} - \sum{n_{subs,i} H_{subst,i}}$
where:
- $\Delta h$ - change of enthalpy during the reaction, we assume that the reaction is the breakdown of bonds in substrates and the formation of new bonds in products,
- $n_{prod,i}$ - number of moles of the i-th product,
- $H_{prod,i}$ - enthalpy of the i-th product,
- $n_{subst,i}$ - number of moles of the i-th substrate,
- $H_{subst,i}$ - enthalpy of the i-th substrate.
Higher energy corresponds to shorter bond. However, there is no simple relationship that allows to convert the bond length into energy or vice versa.
Bond energy is a measure of its strength. The higher is the bond energy, the more work you have to do to break it.
The bond energy increases with its multiplicity. A double bond between the same pair of atoms will have a higher energy than the analogous single bond.

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bond_energy · chemical_bonds_strength · durability_of_chemical_bonds

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