WorksheetsCHEE2015 - Vapor and Liquid Equilibrium (VLE)
Total questions: 10
Worksheet time: 15mins
In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?
Use of equation of state.
Fugacity coefficient.
Activity coefficient.
None of these.
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?
ΔH = 1
ΔV = 1
ΔH = 0
None of above
If a mixture of A and B boils at a temperature lower than the boiling point of either of the components, what kind of deviation does the mixture show?
No deviation.
Negative deviation from Raoult’s law.
Positive deviation from Raoult’s law.
Maximum and minimum deviation from Raoult’s law.
A volatile liquid with vapor pressure 85 kPa (at sea level, 25° C) is taken to the peak of Mt. Everest. Which of the following is true?
The vapor pressure of the solution decreases.
The vapor pressure of the solution increases.
The vapor pressure of the solution will stay the same.
The solution will condense quickly than when at sea level.
Which of the following binary mixtures obey the Raoult's Law?
Ethanol and water.
Acetone and acetonitrile.
Benzene and toluene.
tert-butanol and 1-propanol.
chlorobenzene and bromo benzene.
What is the boiling point of acetic acid at 94.126 kPa?
Does this mixture forms azeotrope at 303.15 K?
Yes.
No.
At 90°C, the vapour pressure of 1,2-dimethylbenzene is 20 kPa and that of 1,3-dimethylbenzene is 18 kPa. What is the composition of a liquid mixture that boils at 90°C when the pressure is 19 kPa?
The vapour pressure of pure liquid A at 293 K is 68.8 kPa and that of pure liquid B is 82.1 kPa. These two compounds form ideal liquid and gaseous mixtures. Consider the equilibrium composition of a mixture in which the mole fraction of A in the vapour is 0.612. Calculate the total pressure of the vapour.
It is found that the boiling point of a binary solution of A and B with xA = 0.4217 is 96°C. At this temperature the vapour pressures of pure A and B are 110.1 kPa and 76.5 kPa, respectively. Is this solution ideal?
Calculation is needed to answer this question.
YES.
NO.
