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bond energy (mean bond energy) definition
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The average value of the gas-phase bond-dissociation energies (usually at a temperature of 298 K) for all bonds of the same type within the same chemical species. The mean bond energy for methane, for example, is one-fourth the enthalpy of reaction for

CH4(g) C(g) + 4H(g)Tabulated bond energies are generally values of bond energies averaged over a number of selected typical chemical species containing that type of bond.

See also:
Brønsted acid definition
Bodenstein approximation definition
Brønsted acid definition
Breeder Reactor definition
block structure definition
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