Chemistry - Mole Concept Question with Solution | TestHub

The structure of Histamine is

Molecular formula$={\mathrm{C}}_5{\mathrm{H}}_9{\mathrm{N}}_3$
Molecular mass$=111$
% of N$=\frac{\mathrm{w}}{\mathrm{M}}\times 100$
% of$\mathrm{N}=\frac{42}{111}\times 100=37.84\mathrm{\%}$