Solved calculate the experimental deltaHvap. delta H vap R= Chegg.com Enthalpy Changes delta h Nuclear Power A) b) ln((p2) (p1)) = ( Hvap) (R)((1) (T1) ( Standard enthalpy of vaporization (vapH) for water at 100C is 40.66 kJ.. Solved] 1. The boiling point of propane at 1 atm (14.7 psi) pressure is 42.0 C and its H(vap) is 18.8 kJ mol. R = 8.314 Course Hero Delta H^0 vap of water is +40.79 kJ mol at 1 bar and 100 deg C. Change in internal energy for this__