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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Solutions

NEET 2016 · Chemistry · Solutions

Which of the following statements about the composition of the...

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 25oC{25}^{o}C . (Given vapour pressure data at 25oC{25}^{o}C , benzene = 12.8 kPa, toluene = 3.85 kPa)

Options

  1. AThe vapour will contain a higher percentage of benzene.
  2. BThe vapour will contain a higher percentage of toluene.
  3. CThe vapour will contain equal amounts of benzene and toluene.
  4. DNot enough information is given to make a prediction.

Correct answer

A. The vapour will contain a higher percentage of benzene.

Step-by-step solution

A - benzene, B - Toluene

PT=PAoXA+PBoXB{P}_{T} = {P}_{A}^{o}{X}_{A} + {P}_{B}^{o}{X}_{B}

=12.8×0.5+3.85×0.5= 12.8 \times 0.5 + 3.85 \times 0.5

=6.2+1.925= 6.2 + 1.925

=8.125= 8.125

Also, mole fraction of benzene in vapour form

YA=PAoXAPT=6.28.121=0.75{Y}_{A} = \dfrac{{P}_{A}^{o}{X}_{A}}{{P}_{T}} = \dfrac{6.2}{8.121} = 0.75

And mole fraction of Toluene in vapour form

YB=1−0.75=0.25{Y}_{B} = 1 - 0.75 = 0.25
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