2.8 Five grams of the specified pure solvent is placed in a variable volume piston. What are the molar enthalpy and total enthalpy of the pure system when 50% and 75% have been evap- orated at: (i) 30°C, (ii) 50°C? Use liquid at 25°C as a reference state. (a) Benzene (p=0.88 g/cm³) (b) Ethanol (p=0.79 g/cm³) (c) Water without using the steam tables (p² = 1 g/cm³) (d) Water using the steam tables