Q.

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 25o C. (Given, vapour pressure data at 25o C, benzene = 12.8 kPa and toluene = 3.85 kPa)

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a

The vapour will contain a higher percentage of toluene

b

The vapour will contain equal amounts of benzene and toluene

c

Not enough information is given to make a prediction

d

The vapour will contain a higher percentage of benzene

answer is D.

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Detailed Solution

Since, component having higher vapour pressure will have higher percentage in vapour phase. Benzene has vapour pressure of 12.8 kPa which is greater than that of toluene (3.85 kPa). Therefore, the vapour will contain a higher percentage of benzene.
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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 25o C. (Given, vapour pressure data at 25o C, benzene = 12.8 kPa and toluene = 3.85 kPa)