Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is

Question

Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is (A) 3 (B) 4 (C) 5 (D) 6

Tardigrade Admin · Accepted Answer

Mass of 1 molecule of caffine =194 amu N present in one molecule =(28.9 × 194/100) =56 amu 56 amu pertains to 4 nitrogen (N) atoms

Q. Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is

3

4

5

6

Mass of $1$ molecule of caffine $= 194$ amu
$N$ present in one molecule $= \frac{28.9 \times 194}{100}$
$= 56$ amu
$56$ amu pertains to $4$ nitrogen $(N)$ atoms

Q. Caffine contains 28.9% by mass of nitrogen. If molecular mass of caffine is 194, then the numberof N atoms present in one molecule of caffine is

3

4

5

6

Mass of 1 molecule of caffine =194 amu N present in one molecule =10028.9×194​ =56 amu 56 amu pertains to 4 nitrogen (N) atoms

Mass of $1$ molecule of caffine $= 194$ amu
$N$ present in one molecule $= \frac{28.9 \times 194}{100}$
$= 56$ amu
$56$ amu pertains to $4$ nitrogen $(N)$ atoms