U Will yol lh this class. God Bless! Prob 1 Circle Rnal Ansuoer!!! nOv 5.10. The

Question

U Will yol lh this class. God Bless! Prob 1 Circle Rnal Ansuoer!!! nOv 5.10. The normal boiling point of toluene is 110.62 °C. Estimate its vapor pressure at 80.00 °C assuming that toluene obeys Trouton's rule. Prob 2 Two iquids, A and B form an id l 1quid A was 300 K is 350 torr and the normal boiling point of pure liquid B is 375 K. A solution is prepared by mixing 1.2 mole of A with 1.8 moles of B at 300 K. The equilibrium vapor pressure of this solution is found to be 450 torr. eal solution. The vapor pressure of pure a) Compute the change in the Gibbs free energy of mixing for mixing these two solutions together. b) Conpute the equilibrium vapor pressure of pure liquid B at 300 K. c) Compute the heat of vaporization of pure liquid B. (Assume that the heat of vaporization is independent of temperature and that all the vapors behave ideally) rob 3 Consider two liquids A and B that form an ideal solution with ideal vapors. Assume the the normal freezing po ints of A and B are T." = 250 K and T,- = 300 K, respectively. Assume that the molar heats of fusion of A and B are equal and is 1 KJ/mole containing a mole fraction of A, XA, is will freeze which one of the two components fr by adjustment of the XA one can use the following expression: . If a solution of B cooled, eventually either A or B out of solution. If one desires to make the temperature at eezes out solution as low as possible

Explanation / Answer

Prob 1.

trouton rule

dSvap = 10.5R

dSvap = 10.5*(8.314)

dSvap = 87.297J/Kmol

now,

dH = T*dS

dHvap = dSvap*Tvap = 87.297*(110.62+273.15)

dHvap = 33501.96 J/mol = 33.5 kJ/mol

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