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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 (25 C). (Given, Vapour Pressure Data at 25 C, benzene = 12.8 kPa, toluene = 3.85 kPa)



Your Answer
A

The vapour will contain a higher percentage of toluene

Your Answer
B

The vapour will contain equal amounts of benzene and toluene

Your Answer
C

Not enough information is given to make a prediction

Correct Answer
D

The vapour will contain a higher percentage of benzene


Solution

The correct option is B

The vapour will contain a higher percentage of benzene


The component that has a higher vapour pressure will have a higher percentage composition in the vapour phase.

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