Enthalpies of vaporization for esters covering a molecular weight range of about 74 -939 g/mol β
[monocarboxylics; linear esters of sebacic series; branched esters of triglyceride series; and, oligomer esters of poly(hexamethylene sebacate)] and a temperature range of about 273.15-523.15 K have been empirically fitted to within about 5% to an equation of the following form: β¬Hv(T,M) Ο S(T) f(M) Ο© I 0 (T), where S(T) Ο C Ln(T) Ο© K 0 , I 0 (T) Ο aT Ο© b 0 , and f(M) Ο M/(1 Ο© a 0 M), M is the molecular weight (molar mass); T is in degrees Kelvin; and, C, K 0 , a, b 0 , and a 0 are constants. These results were used to determine the heat capacity difference, β¬C p Ο C p (l ) Οͺ C p ( g), and compared to calculated values from functional relationships of C p (l ) and C p ( g), l is liquid g is gas. The heat capacity difference results in conjunction with C p (l ) were used to empirically calculate the heat capacity of the gas, C p ( g), over the molecular weight and temperature ranges investigated and compared to a group contribution method. The functional forms for β¬Hv(T,M), β¬C p (T,M), C p (l ), and C p ( g) were also found to be applicable for n-alkanes.