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Mole fractions in the vapour and liquid phases of an ideal solution of two volatile liquids

This type of question, asked 4 times: 2021 Paper 11, 28 Jun 2022, 9 Apr 2024, 24 Jan 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 11

    32
    Vapour pressure of benzene and methylbenzene are 70 and 20 respectively. Both are equimolar mixture. Find the mole fraction of benzene in vapour phase?

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  2. Question 2

    28 Jun 2022

    55
    The vapour pressures of two volatile liquids AA and BB at 25∘C25^{\circ}C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of AA, then the mole fraction of liquid BB in the vapour phase is x17\frac{x}{17}. The value of xx is

  3. Question 3

    9 Apr 2024

    143
    The vapour pressure of pure benzene and methyl benzene at 27∘C27^{\circ}C is given as 80 Torr and 24 Torr, respectively. The mole fraction of methyl benzene in vapour phase, in equilibrium with an equimolar mixture of those two liquids (ideal solution) at the same temperature is _____ ×10−2\times10^{- 2} (nearest integer)

  4. Question 4

    24 Jan 2026 S2

    29
    Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and 15kNm−215kNm^{- 2} respectively. What is the mole fraction of A in solution of A and BB in equilibrium with a vapour in which the mole fraction of A is 0.8 ?

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