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VIT Engineering VIT Engineering Solved Paper-2015

  • question_answer
    Caffeine has a molecular weight of 194 u. If it contains 28.9% by mass of nitrogen, number       of atom of nitrogen in cue molecular of        caffeine is

    A)  4        

    B) 6

    C) 2                                             

    D) 3

    Correct Answer: A

    Solution :

    Molecular weight of caffeine = 194 u N present in one molecule of caffeine = 28.9% of \[L=\frac{1}{{{\omega }^{2}}C}\] Mass of one N atom = 14 m \[=\frac{1}{{{\left( 1000 \right)}^{2}}\times 10\times {{10}^{-6}}}\]         14 u = 1n atom \[=\frac{1}{10}H\]         \[\therefore \]                                


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