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Solutions question

2016 · Q87
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Solutions question

2016 · Q87

NEETChemistrySolutionsMCQ+4 / −1
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. (Given, vapour pressure data at 25oC, benzene = 12.8 kPa, toluene = 3.85 kPa)
  1. A
    The vapour eill contain equal amounts of benzene and toluene.
  2. B
    Not enough information is given to make a prediction.
  3. C
    The vapour will contain a higher percentage of benzene.
  4. D
    The vapour will contain a higher percentage of toluene
View written solutionFree

Correct answer: C

pBenzene = xBenzene. poBenzene

pToluene = xToluene. poToluene

For an ideal 1 : 1 molar mixture of benzene and toluene

xBenzene = 12{1 \over 2}21​ and xToluene = 12{1 \over 2}21​

pBenzene = 12{1 \over 2}21​poBenzene = 12×12.8{1 \over 2} \times 12.821​×12.8 = 6.4 kPa

pToluene = 12{1 \over 2}21​poToluene = 12×3.85{1 \over 2} \times 3.8521​×3.85 = 1.925 kPa

Thus, the vapour will contain a high percentage of benzene as the partial vapour pressure of benzene is higher as compared to that of toluene.

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