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Why the vapour pressure of a solution of...

Why the vapour pressure of a solution of glucose in water is lower than of pure water

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(a) Vapour Pressure . Vapour pressure of a liquid (or solution) is the pressure exerted by its vapours in equilibrium with the liquid (on solution) at a particular temperature .
(b) The presence of non volatile solute in a solution reduces the escaping tendency of the solvent molecules into vapour phase because some of solute particles occupy the position of solvent molecules on liquid surface . This lowers the vapour pressure .
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Knowledge Check

  • The vapour pressure of an aqueous solution of glucose is 750 mm of mercury at 100^@ C . Mole fraction of solute will be

    A
    0.103
    B
    0.013
    C
    0.025
    D
    0.45

  • At 100^@C , the vapour pressure of a solution of 6.5 g of solute in 100 g of water is 732 mm. If k_b is 0.52 klm, the boiling point of solution will be:

    A
    `102^@C`
    B
    `103^@C`
    C
    `101^@C`
    D
    `100^@C`

    • Similar Questions

    Explore conceptually related problems

    The vapour pressure of water at 293K is 0.0231 bar and the vapour pressure of a solution of 108.24 g of a compound in 1000 g of water at the same temperature is 0.0228 bar. Calculate the molar mass of the solute.

    Sea water is _______ dense than pure water.

    Benzene and toluene form nearly ideal solution. At a certain temperature the vapour pressure of pure benzene and toluene are 150 and 50 torr. respectively. Calculate the vapour pressure of solution containing equal weights of benzene and toluene at this temperature .

    How can you justify the observtation that the vapour pressure of the solution of a non-voltile solute in a given solvent is lower than that of the pure solvent. Also the laws concerning this observations.

    Equal mass of a soute are dissolved in equal mass of two solvents A and B and formed very dilute solution. The relative lowering of vapour pressure for the solution B has twice the relative lowering of vapour pressure for the solution A. If m_(A) "and" M_(B) are the molecules mass of solventds A and B respectively, then :

    At 298 K the vapour pressure of pure benzene C_6H_6=0.256 bar and vapour pressure of pure toluene, C_7H_8= 0.925 bar. If the mole fraction of benzene in solution is 0.40. Find the total vapour pressure of solution. Also find the mole fraction of toluene in vapour phase.

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