Construct Pxy diagram for the cyclohexane(1) - benzene(2) system at 40^{o}C. Use the following expressions for the liquid-phase activity coefficients:
ln g
_{1} = 0.458 x_{2}^{2}
ln g
_{2} = 0.458 x_{1}^{2}
At 40^{o}C, P_{1}^{sat} = 0.243 atm; and P_{2}^{sat} = 0.241 atm.
The vapor pressure of components A and B of a binary system at 80^{o}C and 760 mm Hg are 540 mm Hg and 620 mm Hg respectively. An azeotrope contains 20% A at 80^{o}C. Find Van Laar constants. What is the composition of a vapor corresponding to a liquid composition of 80% A?
The azeotrope of propanol-water system has a composition of 43.2 mole % of propanol with a boiling point of 87.8^{o}C at a total pressure of 760 mm Hg. The vapor pressures of propanol and water at this temperature are 524 and 483 mm Hg respectively. Calculate the Van Laar constants and evaluate the activity coefficients of propanol and water for a solution containing 30 mole % propanol.
The vapor pressure of toluene is given by the relation: ln P^{sat} = 13.9987 - 3096.52/(219.48 + t), where t is in ^{o}C and P^{sat} in kPa. What is the latent heat of vaporization at 107.2^{o}C?
Two components A and B form a maximum boiling azeotrope at 90^{o}C and 760 mm Hg. The composition of azeotrope is 60 mole % A. The vapor pressure of A and B at 90^{o}C are 600 and 300 mm Hg respectively. Calculate the Margules constants and plot ln g
_{A }Vs. x_{A}.
An experimental determination of a VLE state for ethanol - toluene system gave the following results. Vapor pressure at 45^{o}C: Ethanol = 173 mm Hg, Toluene = 75.4 mm Hg, x_{1} = 0.3 y_{1} = 0.634, P_{T} = 183 mm Hg. Calculate (i) the liquid phase activity coefficient (ii) does the liquid phase exhibit positive or negative deviation from ideal solution behavior?