Bond Enthalpies and gas phases

[705279989]

Why are bond enthalpies only limited to gas phases?

[Sjeffrey_1C]

I don't think that is the case. I may be wrong, but I remember in lecture it being said that you can use bond enthalpies for liquids or solids but you need to add the enthalpy of the phase change, or something along those lines.

[Shutong Hou_1F]

Is it because the bond enthalpies are measured in the gas phase? We could actually still make good use of bond enthalpies in gas phase by adding enthalpy of vaporization when calculating bond enthalpies in liquid phase.