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Caffeine has a molecular weight of 194. ...

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

A

4

B

6

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
100g caffeine has 28.9g Nitrogen
194g caffeine has ` = (28.9)/(100) xx 194 = 56.06 g`
`therefore ` No. of nitrogen atoms in one molecule of caffeine ` = (56.06)/(14) ~~ 4`.
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