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The amount of energy required to break 1 mol of bonds in gaseous covalent molecules under standards conditions.

 

The bond enthalpy reflects the strength of the bond. If a bond requires a great amount of energy to be broken, that means that the bond is very strong compared to a bond that requires less energy.

 

Bond Enthalpy

Enthalpy changes can also be calculated directly from bond enthalpies. Bond enthalpy is the enthalpy change of process.

Table of Bond Enthalpies

(chemwiki) 

example of Bond Enthalpy

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