Question

3) Liquid – Vapour phase diagrams of binary solutions are drawn to illustrate the composition in the liquid and vapour phases of the two volatile components. The diagrams below show this for the binary mixture of benzene and toluene, which form a nearly ideal binary solution: (A) as a function of Pressure, at 23°C and (B) as a function of temperature at P = 1 atm. The x-axis gives x(benzene). a) Identify the regions as vapour (V), liquid (L) or vapour+liquid (V+L), on graphs A & B. A Pb* P (torr) Pt* 0.0 0.2 0.4 0.6 0.8 1.0 x_benzene^V or L B 390 370 T (K) 350 330 0.0 0.2 0.4 0.6 0.8 1.0 x_benzene^V or L b) A solution is prepared by mixing 2.47 moles of benzene with 1.96 moles of toluene, at T = 23°C. The vapour pressure of pure benzene is 96.4 Torr and that of pure toluene is 28.9 Torr. i. What is the vapour pressure above this solution? ii. What are the mole fractions of each component in the vapour phase? iii. Illustrate these values in Graph A. iv. Use the result to explain how binary liquids can be separated in a distillation column.

          3) Liquid – Vapour phase diagrams of binary solutions are drawn to illustrate the composition in the liquid and vapour phases of the two volatile components. The diagrams below show this for the binary mixture of benzene and toluene, which form a nearly ideal binary solution: (A) as a function of Pressure, at 23°C and (B) as a function of temperature at P = 1 atm. The x-axis gives x(benzene).

a) Identify the regions as vapour (V), liquid (L) or vapour+liquid (V+L), on graphs A & B.

A
Pb*
P (torr)
Pt*
0.0 0.2 0.4 0.6 0.8 1.0
x_benzene^V or L

B
390
370
T (K)
350
330
0.0 0.2 0.4 0.6 0.8 1.0
x_benzene^V or L

b) A solution is prepared by mixing 2.47 moles of benzene with 1.96 moles of toluene, at T = 23°C. The vapour pressure of pure benzene is 96.4 Torr and that of pure toluene is 28.9 Torr.
i. What is the vapour pressure above this solution?
ii. What are the mole fractions of each component in the vapour phase?
iii. Illustrate these values in Graph A.
iv. Use the result to explain how binary liquids can be separated in a distillation column.

$3) Liquid – Vapour phase diagrams of binary solutions are drawn to illustrate the composition in the liquid and vapour phases of the two volatile components. The diagrams below show this for the binary mixture of benzene and toluene, which form a nearly ideal binary solution: (A) as a function of Pressure, at 23°C and (B) as a function of temperature at P = 1 atm. The x-axis gives x(benzene). a) Identify the regions as vapour (V), liquid (L) or vapour+liquid (V+L), on graphs A B. A Pb* P (torr) Pt* 0.0 0.2 0.4 0.6 0.8 1.0 xbenzene^V or L B 390 370 T (K) 350 330 0.0 0.2 0.4 0.6 0.8 1.0 xbenzene^V or L b) A solution is prepared by mixing 2.47 moles of benzene with 1.96 moles of toluene, at T = 23°C. The vapour pressure of pure benzene is 96.4 Torr and that of pure toluene is 28.9 Torr. i. What is the vapour pressure above this solution? ii. What are the mole fractions of each component in the vapour phase? iii. Illustrate these values in Graph A. iv. Use the result to explain how binary liquids can be separated in a distillation column.$

Added by Jose Miguel M.

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