13. The normal boiling temperature of ethanol is 78.5℃ and its molar enthalpy change of vaporization at this temperature is 40.3 kJ/mol. Find AU when 3.000 mol of ethanol are vaporized at 78.5℃ at a constant pressure of 1.000 atm. Neglect the volume of the liquid compared with that of the vapor and assume the ethanol vapor as an ideal gas.
(A) △U = 120.9 kJ
(B) △U = 0.0 kJ
(C) △U = -8.77 kJ
(D) △U = 130.1 kJ
(E) △U= 112.1 kJ
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