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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Atomic Molecular and Equivalent masses

  • question_answer
    Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

    A)                 4             

    B)                 6

    C)                 2             

    D)                 3

    Correct Answer: A

    Solution :

               100gm caffeine has 28.9gm nitrogen                    194gm caffeine has = \[\frac{28.9}{100}\times 194=56.06gm\]                                 \[\therefore \]   No. of atoms in caffeine \[=\frac{56.06}{14}\approx 4\].


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