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DUMET Medical DUMET Medical Solved Paper-2008

  • question_answer
    Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is \[({{k}_{f}}for\,CHC{{l}_{3}}=3.9\,K\,kg\,mo{{l}^{-1}})\]

    A)  79.42 g/mol

    B)  132.32 g/mol

    C)  177.42 g/mol   

    D)  242.32 g/mol

    Correct Answer: C

    Solution :

    Here, elevation in boiling point, \[\Delta {{T}_{b}}=0.323\,K\] weight of anthracene, \[w=0.5143\,g\] weight of chloroform \[W=35\,g\] molal elevation constant \[{{k}_{b}}=3.9\,K\,kg/mol\] \[m=\frac{{{k}_{b}}\times w\times 1000}{W\times \Delta {{T}_{b}}}=\frac{3.9\times 0.5143\times 1000}{0.323\times 35}\] \[=177.42\,g/mol\]


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