Question

Please try the problem again, your previous tries are listed below. Try 1: X 5.97E-005 Try 2: X 0.00011 The melting of a substance at its melting point OR the vaporization of a substance at its boiling point are reversible isothermal processes. Calculate the Entropy change in J/K) that occurs when 25.0 grams ethanol (C2H5OH(g)) condenses at 78.2°C (ethanol's normal boiling point). AH vaporization = 38.6 kJ/mole Include a negative sign in front of your answer if the Entropy decreases!! X 0.00011 Your answer, 0.00011, is incorrect by more than 10%. Submit Cancel to Assignment Menu Back to Main Menu

Answer 1

DH andens AS = ond - TBP AH cendens =-6 Hrap =-38.6 kJ/mol = -38.6x10² Il mot Bp = 78.2°C = 78.2 + 273 = 351. 2k At As = - 38,64103 351,2 Ilk = -59.73 decreases Entropy