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Q.

Caffeine has a molecular mass 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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answer is 4.

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Detailed Solution

Let there are x- atoms of N
$% o f N = 28.9 = \frac{x \times 14}{194} \times 100 \Rightarrow x = 4$

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