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Question

Caffeine has a molecular weight of 194. If it contains $$28.9\%$$ by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is:


A
4
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B
6
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C
2
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D
3
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Solution

The correct option is B 4
$$\because \quad 100gm$$ of caffine contains $$28.9gm$$ of nitrogen atom

$$\therefore \quad 194gm$$ of caffine contains $$\cfrac { 28.9 }{ 100 } \times 194=56.066gm$$

     No of atoms of nitrogen $$=\dfrac { 56.066 }{ 14 } \sim 4$$

Hence, option A is correct.

Chemistry

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