Caffeine (Mol. wt. = 194) contains 28.9% of nitrogen. How many number of nitrogen atoms are present in one molecule of caffeine?

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Solution

The correct option is D 4
Weight of nitrogen in caffeine $= 194 \times 0.289 = 56 g m$

Moles of Nitrogen $= \frac{56}{14} = 4$

therefore, 4 nitrogen atoms are present per molecule of caffeine.

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Molar mass of caffeine is 194. If it contains 28.9% of nitrogen by mass, calculate the number of nitrogen atoms in one molecule of caffeine .

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Caffeine (Mol. wt. = 194) contains 28.9% of nitrogen. How many number of nitrogen atoms are present in one molecule of caffeine?

The correct option is D 4Weight of nitrogen in caffeine=194×0.289=56 gmMoles of Nitrogen=5614=4therefore, 4 nitrogen atoms are present per molecule of caffeine.

The correct option is D 4
Weight of nitrogen in caffeine $= 194 \times 0.289 = 56 g m$

Moles of Nitrogen $= \frac{56}{14} = 4$

therefore, 4 nitrogen atoms are present per molecule of caffeine.