APFIVE Bond Energy and Reaction Enthalpy
The table provides average bond energies for several covalent bonds. All of the following statements concerning bond energies are true EXCEPT:
| Bond | Energy (kJ/mol) |
|---|---|
| H–O | 463 |
| C–H | 413 |
| C=C | 615 |
A
The overall energy change of a reaction can be approximated by summing the energies of bonds broken and then subtracting the energies of bonds formed.
B
Bond energies for double bonds such as C=C are always exactly twice the bond energy of a single bond like C–H.
C
Bond energies represent the energy required to break a bond and are inherently positive values.
D
Molecules with multiple bonds can have overall bond energy contributions that significantly affect the enthalpy change of a reaction.
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