The total vapor pressure above an ideal solution of toluene and benzene is 39.7 mmHg. The vapor pressures of toluene and benzene above this mixture are 14.7mmHg and 25mmHg respectively. What is the mole fraction of toluene in the vapor phase?
Answers
Answer:
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Explanation:
1. The addition of a non-volatile solute to a solvent will cause which of the following: [2]
(a) increase in vapour pressure and decrease in boiling point
(b) decrease in vapour pressure and increase in boiling point
(c) decrease in vapour pressure and decrease in boiling point
(d) increase in vapour pressure and increase in boiling point
2. The total vapour pressure above an ideal solution of toluene and benzene is 39.7 mmHg. The vapour pressures of toluene and benzene above this mixture are 14.7mmHg and 25mmHg respectively. What is the mole fraction of toluene in the vapour phase? [3]
(a) 0.630 (b) 0.299 (c) 0.701 (d) 0.370
3. The partition coefficient is given by [1]
(a) the ratio of the solute concentration in the lower layer to the solute concentration in the interface
(b) the difference between the solute concentration in the upper layer and the lower layer divided by the sum of the solute concentration in both layers
(c) dividing the solute concentration in the upper layer by the solute concentration in the lower layer
(d) the difference between the solute concentration in the upper layer and the lower layer divided by the solute concentration in the lower layer
4. The mole fraction of A in an A-B mixture is equal [1]
(a) to the sum of the relative masses of A and B
(b) the number of moles of A divided by the total number of moles of A and B
(c) the number of moles of A minus the number of moles of B divided by the total number of moles of A and B
(d) the number of moles of A divided by the number of moles of A minus the number of moles of B
5. The partition coefficient for iodine between water and carbon disulphide at 20oC is 2.43 x 10-3. A 100 cm3 sample of a solution of iodine in water of concentration 1.00 x 10-3 moldm-3 I2 is shaken with 10.0 cm3 of carbon disulphide.
(a) Write an equation for the partition coefficient. [2]
………………………………………………………………………………………….
(b) Calculate the total number of moles of I2. [2]
(c) Determine the number of moles of I2 extracted by CS2. [4]
(d) What fraction of I2 is extracted by CS2 . [2]
6. Calculate the mole fraction of each component in a methanol-ethanol mixture over which the equilibrium vapour pressure is 6.0 kPa. Assume the mixture is ideal. (Vapour pressure of pure methanol is 8.9 kPa and of pure ethanol is 4.0 kPa) [6]
Submitted by chemistry123 on Thu, 05/16/2013 - 17:19
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for 1 use the fact that vapor
for 1 use the fact that vapor pressure of a solvet is lowered by the addition of non volatile solute and boilig point increases by the additio of non volatile solute.
for 2 use the formula;
P = P0a Xa + P0bXb
P = total vapor pressure of solution
P0a and Xa is vapor pressure and mole fraction of component a.
P0b and Xb is vapor pressure and mole fraction of component b.
here component a and b are toluene and benzene respectively...