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BCECE Engineering BCECE Engineering Solved Paper-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.\[m=\frac{100\times {{k}_{b}}\times w}{\Delta {{\Tau }_{b}}\times W}\] Given    \[{{k}_{b}}=5.2\] \[w=\]mass of solute \[=6\text{ }g\] \[W=\]mass of solvent \[=100\text{ }g\] \[\Delta {{\Tau }_{b}}=\]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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