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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

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The correct Answer is:
A
100 gm caffeine has 28.9 gm Nittogen
194 gm caffeine has `=28.9/100xx194=56.06` gm
`:.` No. of nitrogen atoms in caffeine `=56.06/14 ~~4`
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