NEET | 2016Aromatic HydrocarbonsHard
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 at 25ð‘œð¶. (Given vapour pressure data at 25ð‘œð¶, benzene = 12.8 kPa, toluene = 3.85 kPa)
Options
A.
The vapour will contain a higher percentage of benzene
B.
The vapour will contain a higher percentage of toluene
C.
The vapour will contain equal amounts of benzene and toluene.
D.
Not enough information is given to make a prediction.
Solution
A - benzene, B - Toluene
= 12.8 0.5 + 3.85 0.5
= 6.2 + 1.925
= 8.125
Also, mole fraction of benzene in vapour form
ð‘Œð´ =
And mole fraction of Toluene in vapour form
ð‘Œðµ = 1 - 0.75 = 0.25
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