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Why is bond enthalpy only measured in homolytic fission watch

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    Hi
    I've got this definition that I have to know

    "Bond enthalpy is the energy change that occurs when breaking by homolytic fission 1 mole of a given bond in the molecules of a gaseous species."




    I was wondering why it isn't, or possibly can't be measured when bonds are broken by heterolytic fission.
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    (Original post by SteveCrain)
    Hi
    I've got this definition that I have to know

    "Bond enthalpy is the energy change that occurs when breaking by homolytic fission 1 mole of a given bond in the molecules of a gaseous species."




    I was wondering why it isn't, or possibly can't be measured when bonds are broken by heterolytic fission.
    bond enthalpy when doing heterolytic fission involves additional contribution from forming the ions too, so it would incorporate any ionisation energy or electron affinity terms, you see what i mean. draw out an energy cycle diagram to convince yourself.

    alternatively, think of heterolytic as stepwise, first homolytic process then the formation of the ions
 
 
 
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