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AMU Medical AMU Solved Paper-1998

  • question_answer
    An ideal solution shows a vapour pressure of 80 torr when the mole-fraction of the solute is 0.2. At the same temperature, the vapour pressure of the pure solvent should be

    A)  64 torr           

    B)  80 torr

    C)  100 torr          

    D)  400 torr

    Correct Answer: C

    Solution :

    : Ace. to Raoults law \[\frac{{{P}_{0}}-{{P}_{s}}}{{{P}_{0}}}=\]mole fraction of solute. \[\frac{{{P}_{0}}-80}{{{P}_{0}}}=0.2\Rightarrow {{P}_{0}}-80=0.2{{P}_{0}}\] \[\Rightarrow \]\[0.8{{P}_{0}}=80\]\[\Rightarrow \]\[{{P}_{0}}=100\,torr\].


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