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Entropy? Enthalpy? more like gibberish!?!! Don't worry you have come to the right place!
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.