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BCECE Medical BCECE Medical Solved Papers-2003

  • question_answer
    Elevation in boiling point was \[{{0.52}^{o}}C\] when 6g of a compound was dissolved in 100 g of water. Molecular weight of X is (\[{{K}_{b}}\] of water is \[{{5.2}^{o}}C\]per 100 g of water):

    A)  120           

    B)  60

    C)  600           

    D)  180

    Correct Answer: B

    Solution :

    Key Idea: \[m=\frac{100\times {{k}_{b}}\times w}{\Delta \,\,{{T}_{b}}\times W}\] Given    \[{{k}_{b}}=5.2\]                 w = mass of solute = 6 g.                 W = mass of solvent = 100 g \[\Delta \,\,{{T}_{b}}=\] Elevation in boiling point \[={{0.52}^{o}}C\] m = molecular weight = ? \[\therefore \] \[m=\frac{100\times 5.2\times 6}{0.52\times 100}=60\]


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