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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2010

  • question_answer
        At\[25{}^\circ C,\]3 g of a solute A in 100 mi/of an aqueous solution gave an osmotic pressure of 2.5 atmosphere. What is the molar mas5 of solute?

    A)  293

    B)  239

    C)  392                                       

    D)  932

    Correct Answer: A

    Solution :

                    \[\pi =CRT=\frac{nRT}{V}=\frac{{{w}_{B}}RT}{{{M}_{B}}V}\] Or           \[{{M}_{B}}=\frac{{{w}_{B}}RT}{\pi V}\]                 \[{{M}_{B}}=\frac{3\times 0.082\times 298}{2.5\times 100/1000}=293\]


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