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Why is the vapour pressure of liquid con...

Why is the vapour pressure of liquid constant at a constant temperature ?

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Vapour pressure is the pressure of the vapour at equilibrium state when the rate of evaporation becomes equal to the rate of condensation. The equilibrium constant does not change at a particular temperature and therefore the vapour pressure remains constant.
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Solution of two volatile liquids x and y obey Raoult's law. At a certain temperature it is found that when the total pressure above a given solution is 400 mm of Hg , the mole fraction of x in the vapour is 0.45 and in the liquid is 0.65 . What are the vapour pressures of two pure liquids at the given temperature?

If a gas expands at constant temperature.

Knowledge Check

  • If a gas expands at constant temperature

    A
    the pressure increases
    B
    the kinetic energy of the molecues remains same.
    C
    the kinetic energy of the molecules decreases
    D
    the kinetic energy of the molecules of the gas increases

  • Our of the below two compounds the vapour pressure of (B) at a particular temperature is

    A
    higher than that of )A)
    B
    lower than that of (A)
    C
    higher or lower than (A)
    D
    same as that of (A)

  • Out of the two compounds below the vapour pressure of (B) at a particular temperature is

    A
    higher than that of (A)
    B
    lower than that of (A)
    C
    higher or lower than (A), depending on the size if the vessel
    D
    same as that of (A)

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