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Question

Which of the following statements 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 25C. (Given,vapour pressure data at 25C. benzene = 12.8 kPa, toluene = 3.85 kPa )

A
The vapour will contain equal amounts of benzene and toluene.
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B
Not enough information is given to make a prediction.
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C
The vapour will contain a higher percentage of benzene.
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D
The vapour will contain a higher percentage of toluene.
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Solution

The correct option is C The vapour will contain a higher percentage of benzene.
pbenzene=xbenzeneP0benzene
ptoluene=xtoluene P0toluene
For an ideal 1 : 1 molar mixture of benzene and
tolune, xbenzene=12 and xtoluene=12
pbenzene=12 P0benzene=12×12.8KPa=6.4 kPa
ptolune=12P0toluene=12×3.85 KPa=6.4 kPa
Thus, the vapour will contain a high percentage of benzene as the partial vapour pressure of benzene is higher as compared to that of toluene.

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