bond energy

The average energy needed to break one mole of a particular covalent bond in molecules in the gas state. It is measured in kJ mol⁻¹. Bond-breaking is an endothermic process, so all bond energies have positive values.

The stronger the bond, the greater the bond energy.

Bond	Bond energy /kJ mol–1
C–C	347
C–O	358
N–H	391
C–H	415
H–H	436
O–H	464
O=O	498
C=C	612
C=O	805
N≡N	945

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