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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    The vapour pressure of two liquids X and Y are 80 and 60 Torr respectively. The total vapour pressure of the ideal solution obtained by mixing 3 moles of X and 2 moles of Y would be

    A)  68 Torr                                

    B)  140 Torr

    C)  48 Torr                                

    D)  72 Torr

    E)  54 Torr

    Correct Answer: D

    Solution :

                    Moles of X, \[{{n}_{X}}=\frac{3}{3+2}=\frac{3}{5}\] Moles of Y, \[{{n}_{Y}}=\frac{2}{3+2}=\frac{2}{5}\] \[{{P}_{T}}={{P}_{X}}{{n}_{X}}+{{P}_{Y}}{{n}_{Y}}\]      \[=80\times \frac{3}{5}+60\times \frac{2}{5}\]      \[=48+24=72\,\text{Torr}\]


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