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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answer is A.

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Detailed Solution

100 g caffeine has 28.9 g nitrogen194 g caffeine has = 28.9100 × 194=56.06g∴ No. of atoms of nitrogen in one molecule of caffeine = 56.0614 ≈4.

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