Determine the molar free energy of vaporization, Delta vapG, for benzene at 75 C and 1 bar given that the molar enthalpy of vaporization of benzene at its normal boiling point of 80.09 C and 1 bar is 30.72 kJ⋅mol−1. The molar enthalpies and molar entropies of vaporization are not constant over all temperatures. Instead, make use of the molar heat capacities of liquid and gaseous benzene, 136.3 and 82.4 J ⋅ mol−1 K−1.