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    • 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?
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    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?

    jaswinsurya111 20th Oct, 2020
    Answer
    Answer (1)
    Ankit Banerjee 20th Oct, 2020

    Hello Jaswin,

    The answer to this problem lies in the simple unitary method followed by a division.

    Considering 100g of caffeine, the content of nitrogen is 28.9g.

    Now, 100g of caffeine contains 28.9g of Nitrogen

    1g of caffeine contains 28.9/100 g of Nitrogen

    therefore 194g of caffeine contains (28.9/100)*194 = 56.06g of Nitrogen.

    Dividing the weight of Nitrogen present with the atomic weight of Nitrogen, i.e 14, 56.06/14, we get approximately 4.

    Therefore 4 atoms of Nitrogen is present in 194g of caffeine.

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    24th Oct, 2020
    Thank you!
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