Standard enthalpy of vaporization (vapH) for water at 100C is 40.66 kJ.. Delta H^0 vap of water is +40.79 kJ mol at 1 bar and 100 deg C. Change in internal energy for this__ 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 Use Hess's law to prove that Delta subH = Delta vapH + Delta fusH. Homework.Study.com
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