Question
Define bond enthalpy (or bond energy).
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Answer
Bond enthalpy (or Bond energy) : The enthalpy change or amount of heat energy required to break one mole of particular covalent bonds of gaseous molecules forming free gaseous atoms or radicals at constant temperature ( $298 K$ ) and pressure ( 1 atmosphere) is called bond enthalpy or bond energy. For example, bond enthalpy of $H _2$ is $436.4 kJ mol ^{-1}$.
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