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

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Decimals

Bond energy

BondBond energy
[kJ/mol]
Notes
Al-C255-
S-Br218-
As-As146-
S-Cl255-
As-Cl298-
S-F284-
As-I180-
Cl-O251-
As-O355-
Cs-H176-
B-Br377-
H-As247-
B-C372-
H-B389-
B-Cl456-
H-Br366-
B-F644-
H-C415-
B-N444-
H-C427benzene
B-O536-
H-C435alkens
Be-Cl456-
H-Cl431-
Be-I289-
H-F566-
Be-Br193-
H-H436-
Be-O201-
H-I298-
C-As201-
H-Li243-
C-Br284-
H-N389-
C-C347-
H-O465-
C-C487benzene
H-P322-
C=C568graphite
H-S347-
C=C611-
H-Se276-
C≡C837-
H-Te238-
C-Cl339-
F-F159-
C-F485-
I-F264-
C-I213-
I-I151-
C-N305-
I-O201-
C=N615-
Li-Li105-
C≡N891-
N-Cl192-
C-O360-
N-F272-
C=O741-
N-N54N2O4
C=O1075CO
N-N163-
C-P264-
N=N418-
C-S272-
N-O468NO2, N2O4, N2O5
C=S536 -
N=O631NO
Cl-Cl242-
N=O439nitro compounds
N-O168N2O
S=O460-
Na-H201-
S-O226-
O-F188-
S=S418-
O-O146-
Se-Se172-
O=O499-
Si-Br310-
P-Br264-
Si-C301-
P-Cl326-
Si-Cl381-
P-F490-
Si-F565-
P-I184-
Si-H318-
P-O335-
Si-I234-
P-P201-
Si-O488-
P=P490-
Si-Si222-
Pb-C130-
U-F515-

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 :
    kJmol\frac{kJ}{mol}
  • Knowing the energies of bonds present in products and substrates, we can estimate the enthalpy of the chemical reaction:
    Δh=nprod,iHprod,insubs,iHsubst,i\Delta h = \sum{n_{prod,i} H_{prod,i}} - \sum{n_{subs,i} H_{subst,i}}
    where:
    • Δh\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,
    • nprod,in_{prod,i} - number of moles of the i-th product,
    • Hprod,iH_{prod,i} - enthalpy of the i-th product,
    • nsubst,in_{subst,i} - number of moles of the i-th substrate,
    • Hsubst,iH_{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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