Sunday, February 7, 2010

Cyclohexanol has a heat of vaporization of 54 kJ/mol and (...) Which of the following is false?

Cyclohexanol has a heat of vaporization of 54 kJ/mol and the absolute entropies of the liquid and gas are 200 and 328 J/K-mol, respectively. Which of the following is false?











a. The entropy of vaporization is positive.


b. The heat of formation of liquid cyclohexanol is less than that of the vapour.


c. At 80oC the free energy change for the vaporization is negative.


d. At the boiling point the free energy change for vaporization is zero.


e. At 80oC, cyclohexanol vapour spontaneously condenses into a liquid.











help pleaseCyclohexanol has a heat of vaporization of 54 kJ/mol and (...) Which of the following is false?
First find the boiling point, the temperature such that





DeltaG0 = DeltaH0 - T*DeltaS0





is zero (why is this the b. pt.?)





Then go through the statements one by one, using definitions.

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