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:

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Solution

The correct option is B 4
$∵ 100 g m$ of caffine contains $28.9 g m$ of nitrogen atom

$∴ 194 g m$ of caffine contains $\frac{28.9}{100} \times 194 = 56.066 g m$

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

Hence, option A is correct.

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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(pls give an explanation for necessary steps)

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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:

The correct option is B 4∵100gm of caffine contains 28.9gm of nitrogen atom∴194gm of caffine contains 28.9100×194=56.066gm No of atoms of nitrogen =56.06614∼4Hence, option A is correct.

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:

The correct option is B 4
$∵ 100 g m$ of caffine contains $28.9 g m$ of nitrogen atom

$∴ 194 g m$ of caffine contains $\frac{28.9}{100} \times 194 = 56.066 g m$

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

Hence, option A is correct.