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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Solution

One mol caffeine has wt. 194g
So,mass of nitrogen in one mole of caffeine = 28.9/100*194= 56g.

We know the mass of nitrogen is 14g
So, no. Of Nitrogen atoms in one mole caffeine = 56/14=4atoms

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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 .

One mol caffeine has wt. 194g So,mass of nitrogen in one mole of caffeine = 28.9/100*194= 56g. We know the mass of nitrogen is 14g So, no. Of Nitrogen atoms in one mole caffeine = 56/14=4atoms

One mol caffeine has wt. 194g
So,mass of nitrogen in one mole of caffeine = 28.9/100*194= 56g.

We know the mass of nitrogen is 14g
So, no. Of Nitrogen atoms in one mole caffeine = 56/14=4atoms