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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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a

2

b

6

c

3

d

4

answer is A.

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Detailed Solution

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28.9% means

100 g of caffeine has 28.9 g of N

194 g of caffeine has 28.9100×194g of N

Let no. of nitrogen atoms be x 

⇒ x×14=28.9100×194

∴ x=4

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