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Which of the following statement about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given: Vapour Pressur Data at 25°C, benzene=12.8 kPa, toluene=3.85 kPa)
- Option 1)
The vapour will contain a higher percentage of benzene
- Option 2)
The vapour will contain a higher percentage of toluene
- Option 3)
The vapour will contain equal amounts of benezene and toluene
- Option 4)
Not enough information is given to make a predication
Answers (1)
As learnt
Rault's Law -
The total vapour pressure of binary mixture of miscible liquids be having ideally is given by
Where and
are mole fraction of A and B in liquid phase.
- wherein
and
are vapour pressures of pure liquids.
Vapour pressure due to benzene=
mole fraction of benzene in solution
vapour pressure of benzene= 12.8 kPa
Vapour pressure due to toluene=
mole fraction of toluene
vapour pressure of toluene = 3.85 kPa
Since,
Therefore, vapour will contain more benzene due to it's higher pressure.
Option 1)
The vapour will contain a higher percentage of benzene
This option is correct
Option 2)
The vapour will contain a higher percentage of toluene
This option is incorrect
Option 3)
The vapour will contain equal amounts of benezene and toluene
This option is incorrect
Option 4)
Not enough information is given to make a predication
This option is incorrect
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