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BVP Medical BVP Medical Solved Paper-2002

  • question_answer
    The vapour pressure of benzene at a certain temperature is 640 mm of Hg. If 2.175 g of a non-volatile solid is added to 39.08 g of benzene, the vapour pressure of solution is 600 mm of Hg. The molecular weight of the solid substance will be:

    A)  \[48.60\]           

    B)  \[44.2\]

    C)  \[64.26\]           

    D)  \[69.45\]

    Correct Answer: D

    Solution :

                      \[\frac{{{P}_{0}}-{{P}_{S}}}{{{P}_{0}}}=\frac{\omega \times M}{W\times m}\] \[\frac{640-600}{640}\,\,\,\,\frac{2.175\times 78}{m\times 39.08}\] (mol. wt. of \[{{C}_{6}}{{H}_{6}}=78\]) \[m=\frac{2.175\times 78\times 640}{40\times 39.08}\] \[m=69.45\]


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