What is the relationship among the magnitudes of the enthalpies of combustion (${\mathrm{\Delta H}}_{\mathrm{comb}}$), fusion (${\mathrm{\Delta H}}_{\mathrm{fus}}$) and vaporization (${\mathrm{\Delta H}}_{\mathrm{vap}}$) for a hydrocarbon such as hexane, ${\mathrm{C}}_6{\mathrm{H}}_{14}$?

Since gas molecules have the biggest intermolecular space and the force of attraction between the molecules is essentially nonexistent, the latent heat of vaporisation is greater than the latent heat of fusion. As a result, turning a liquid into a gas requires more energy.