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    Properties of solutions - Propylene Glycol

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    9) Calculate the mass of propylene glycol (C3H8O2) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.88 torr at 40 °C.

    10) Calculate the freezing point and boiling point of an antifreeze solution that is 50.0 % by mass of ethylene glycol (C2H6O2) in water.

    11) Calculate the freezing point and boiling point of a barium chloride solution that is 4.0 % by mass of barium chloride in ethanol.

    13) What is the osmotic pressure of a solution formed by dissolving 44.2 mg of aspirin (C9H8O4) in 0.358 L of water at 25 °C?

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    9) Calculate the mass of propylene glycol (C3H8O2) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.88 torr at 40 °C.

    molar mass of propylene glycol = 76

    mass of water = 340 g

    molar mass of water = 18
    no. of moles of water, n1 = 340 / 18 = 18.89

    lowering of vapor pressure can be given as

    P = Xsolute P

    where P = pure V.P of water = 55.3 torr

    Xsolute = P / P = 2.88 / 55.3 = 0.052

    Now, X solute = mole fraction of solute

    Xsolute = nsolute / (nsolvent + nsolute)

    After calculations,
    Nsolute = 1.033

    N = mass / molar mass
    Therefore, mass = N X molar mass = 1.033 X 76 = 78.5 g

    10) Calculate the freezing point and boiling point of an ...

    Solution Summary

    It investigates the properties of solutions, such as vapor pressure, osmotic pressure, the freezing point and boiling point.

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