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1.2 g of a non-volatile solute is added ...

1.2 g of a non-volatile solute is added to 320 g of methyl alcohol at certain temperature. The vapour pressure is decreased from 400 mm to 399.2 mm Hg. Calculate the molecular weight of solute.

Answer

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Vapour pressure of pure water at 27^@C is 3000kPa. By dissolving 5g of a non volatile molecular solid in 100g of water the vapour pressure is decreased to 2985 k pa. What is the molecular weight of solute ?

Vapour pressure of pure water at 27^@C is 3000k Pa. By dissolving 5 g of a non volatile molecular solid in 100 g of water the vapour pressure is decreased to 2985 k Pa. What si the molecular weight of solute?

Knowledge Check

  • When 25 g of a non-volatile solute is dissolved in 100g of water, the vapour pressure is lowered by 2.25 xx 10^(-1)mm . If the vapour pressure of water at 20^(@)C is mm, what is the molecular weight of the solute?

    A
    206
    B
    302
    C
    350
    D
    276

  • 6 g. of a non volatile solute is dissolved in 90g. of water, such that the lowering in vapour pressure is 2%. The molecular weight of the solute is

    A
    65
    B
    92
    C
    60
    D
    80

  • At 20^@C , the vapour pressure of diethyl ether is 442mm. When 6.4g. of a non-volatile solute is dissolved in 50g. of ether, the vapour pressure falls to 410mm. The Molecular weight of the solute is

    A
    150
    B
    130.832
    C
    160
    D
    180

    • Similar Questions

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    Calculate the vapour pressure of a solution containing 10gm of non-volatile solute in 80gm of ethanol of at 298K [The vapour pressure of pure ethanol at 298K is 22.45 mm and Molecular weight of solute is 120]

    What weigth of a non-volatile solute (molar mass 40 g) should be dissolved in 114 g of octance to reduce its vapour pressure by 20%.

    The vapour pressure of 4% solution of a non-volatile solute in water at 100^@C is 745 mm. What is the molecular weight of solute?

    Vapour pressure of aqueous glucose at 373 K is 750 mm Hg. Calculate the molality of solute present dissovled solution.

    A Solution of a non-volatile solute in water freezes at -0.30^@C . The vapour-pressure of pure water at 298K is 23.51 mm Hg and K_f for water is 1.86 K. kg "mol"^(-1) Calculate the vapour-pressure of this solution at 298K.

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