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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 250C.
(Given, vapour pressure data at 250C benzene = 12.8 kPa, toluene = 3.85 kPa)

  • The vapour will contain a higher percentage of toluene

  • The vapour will contain equal amounts of benzene and toluene

  • Not enough information is given to make a prediction

  • The vapour will contain a higher percentage of benzene

Answer

D.

The vapour will contain a higher percentage of benzene

A component having vapour pressure will have a higher percentage in the vapour phase. Benzene has vapour pressure 12.8 kPa which is greater than toluene 3.85pKa. Hence, the vapour will contain a higher percentage of benzene.

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