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BOND ENTHALPY

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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"k J mol"^(-1)`. It is denoted by, `Delta H^(@)=346.4" kJ mol"^(-1) or D_(H_(2))=436.4" kJ mol"^(-1)`.
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