The vapour pressure of pure liquid is 70 Torr at 27 °C. The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at 27 °C. The vapour pressure of pure liquid Bat 27 °C is

The vapour pressure of pure liquid is 70 Torr at 27 °C. The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at 27 °C. The vapour pressure of pure liquid Bat 27 °C is

  1. A

    140 Torr

  2. B

    280 Torr

  3. C

    160 Torr

  4. D

    200 Torr

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    Solution:

    p=xApA+xBpB84 Torr =(0.8)(70 Torr )+(0.2)pBpB=140 Torr 

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