The average value of the gas-phase @[email protected] (usually at a temperature of \(298\ \text{K}\)) for all @[email protected] of the same type within the same @[email protected] The mean bond energy for methane, for example, is one-fourth the @[email protected] of reaction for:
Tabulated bond energies are generally values of bond energies averaged over a number of selected typical chemical species containing that type of bond.
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1090 [Terms] [Paper]