Enthalpy(heat) change of hydrogenation
This is the enthalpy change that occurs, when 1 mole of an unsaturated compound is converted to 1 mole of a saturated compound by reaction with hydrogen, at 298K and 100KPa pressure, with the substances in their physical states normal under these conditions.
Bond dissociation enthalpy
The standard molar bond dissociation enthalpy is the enthalpy change, when one mole of bonds of the same type, in gaseous molecules under standard conditions is broken, producing free radicals.
Mean bond enthlpy or Bond enthalpy term E(A-B)
This is the enthalpy change required to break a 1 mole of a specific covalent bond. The value can vary depending on the environment in which the particular bond is found, so an average or 'mean' value is used.
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