Bond enthalpy
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Intros
Examples
Lessons
- Use the mean bond enthalpy values to find the enthalpy change in chemical reactions.
The combustion of propane to make carbon dioxide and water vapour is described in this equation:C3H8 (g) + O2 (g) → CO2 (g) + H2O (g)
The table below shows relevant bond enthalpy data:
Bond:
Mean bond enthalpy1 (kJ mol-1)
C-C
348
C-H
412
O=O
497
C=O
743
O-H
463
Balance the equation and find the enthalpy change of the reaction. - Calculate the mean bond enthalpy from enthalpy of reaction data.
The combustion reaction of butene is described below, with the enthalpy of reaction provided:C4H8 (g) + 6O2 (g) → 4CO2 (g) + 4H2O r = -2062 kJ mol-1
Bond:
Mean bond enthalpy1 (kJ mol-1)
C-C
348
C-H
412
O=O
497
C=O
x
O-H
463
Use this information and the data to find the mean bond enthalpy of the C=O bond.