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 (${25}^{\circ }C$). (Given, Vapour Pressure Data at ${25}^{\circ }C$, benzene = 12.8 kPa, toluene = 3.85 kPa)

• 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 1

The correct option is D

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.