Additionally, we use the following relationship for benzene: . The specific enthalpies of air and benzene are computed using the temperature-dependent expressions of the constant-pressure heat capacities given in [1, Appendix B2]. In order to simplify the computation, we chose these reference states: air (gas) and benzene (vapor) both at 100 °C and 1atm. Thus, the term in the above energy balance equation is exactly equal to zero and can be dropped. It is straightforward to extend this calculation to other components.