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Q.

Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the number of N atoms present in one molecule of caffine is

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a

3

b

4

c

5

d

6

answer is B.

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Detailed Solution

 Approximate\;molecular\;weight\;=\;\large \frac{number\;of\;atoms/molecule\times GAW\;of\;element\times 100}{percentage\;by\;mass\;of\;element\;in\;the\;compound}
Given approximate mol.wt of caffine = 194
GAW of Nitrogen = 14
% by mass of Nitrogen in caffine = 28.9%
Substituing these values
\large \\\\194\;=\;\frac{N\times 14\times 100}{28.9}\\\\N\;=\;\frac{194\times 28.9}{14\times100 }\\\\N\simeq 4
 

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