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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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Detailed Solution

 Approximate;molecular;weight;=;large frac{number;of;atoms/moleculetimes GAW;of;elementtimes 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{Ntimes 14times 100}{28.9}\\N;=;frac{194times 28.9}{14times100 }\\Nsimeq 4
 

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