Question

1. Saturate vapor pressure of benzene and toluene are 9958 Pa and 2973 Pa, respectively. If we mix benzene and toluene of the same mass, estimate the partial pressure of benzene and toluene and the total pressure of the vapor above the liquid. 2. Liquid A and liquid B form an ideal solution when they are mixed. There is a cylinder filled with a gaseous mixture in which the mole fraction of A is 0.4 and sealed by piston. If the piston is pressed isothermally at the temperature T (PÅ = 40530 Pa, p; = 121590 Pa), a) When the liquid phase forms, estimate the total pressure and the composition of the liquid phase when there is only one drop of liquid phase formed. b) When the boiling point at 1 atm of a mixture of A and B is T, estimate the composition of the mixture.

Answer 1

Molar comp of Benzine Stolune. 7890 929 x 0,541176 1/70 Yaz f P Gal 99 58 Pa x 0.4580 sat P +2973 Pa. Pa xo Ana P sal I B P 6752.00 Pa Raults lad sat YB P = Xp PB - UB= 0, 7901 & 0.2018 PB (Partial fre) - YB P → 5402.40 Pa Py (Partial Bre) y 600 fa 13 50.4 Pa

2 ) sat P = X AP Sat f UB PB (0.4) P = XA PASat Raults low. - A component in gas 0.4 88 Pogoreth 6.4)(B)(121590) - 061-36) (405 30 XB = XA = 2/3 P 7 (40530) (2) + (121590) - 67550 Pa 3.

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