what is a substance's heat of vaporization
Best Answer: The heat of vaporization is the heat required to change the state of the substance from a liquid into a vapor.No chemical bonds are broken in this process, it is only a physical change. The heat of vaporization would correlate with the melting points of the substances.Chlorine, Fluorine, and Oxygen are all gases at normal temperatures and their melting points are quite low. Bromine is a liquid, while Iodine is a solid with the higest melting point of the elements in the list.he heat of vaporization would correlate with the melting points of the substances. Chlorine, Fluorine, and Oxygen are all gases at normal temperatures and their melting points are quite low. Bromine is a liquid, while Iodine is a solid with the higest melting point of the elements in the list.