Question

Caffeine has a molecular mass of 224. If it contains 12.5% by mass of nitrogen, then the number of
toms of mitrogen in one molecule of caffeine is​

Answer 1

Answer:

2 atoms are present

Explanation:

224*12.5/100.= 28g

Means in caffeine 28 g nitrogen is present.

Molecular mass of N2 is 28 means it contains 2 atoms of nitrogen.

Hence in 28g of N2 contains 2 atoms of nitrogen.

Answer 2

Answer:

2 atoms of nitrogen.

Explanation:

From the question we get that the caffeine is with 12.5% of nitrogen by mass so the weight will be 224*12.5/100= 28g.

So we get that the caffeine has 28 g of the nitrogen present in it.

Since, we also know that the molecular mass of N2 is 28. So, it will contain 2 atoms of nitrogen.

As, we got from the calculation that 28g of caffeine was used. So, 2 atoms of nitrogen is present in 1 molecule of caffeine.