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

4

b

6

c

2

d

3

answer is A.

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Detailed Solution

28.9% means100 g of caffeine has 28.9 g of N194 g of caffeine has 28.9100×194g of NLet no. of nitrogen atoms be x ⇒ x×14=28.9100×194∴ 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: