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  4. Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is

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Q. Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is

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Solution:

Mass of $1$ molecule of caffine $=194$ amu
$N$ present in one molecule $=\frac{28.9 \times 194}{100}$
$=56$ amu
$56$ amu pertains to $4$ nitrogen $(N)$ atoms