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March 26, 2015

Homework Help: Chem (Thermodynamics)

Posted by M on Wednesday, February 29, 2012 at 10:36pm.

The standard molar enthalpy of fusion and the standard molar enthalpy of vaporization of benzene are 10.9 kJ/mol and 31.0 kJ/mol, respectively. Calculate the standard molar entropy changes for the solid ↔ liquid and liquid ↔ vapor transitions for benzene. At 1 atm pressure, benzene melts at 5.5C and boils at 80.1C.
A. ΔSfus = 22.6 J/Kmol; ΔSvap = 67.1 J/Kmol
B. ΔSfus = 39.1 J/Kmol; ΔSvap = 87.8 J/Kmol
C. ΔSfus = 19.8 J/Kmol; ΔSvap = 3.87 J/Kmol
D. ΔSfus = 46.1 J/Kmol; ΔSvap = 101. J/Kmol

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