Derive the molecular formula of an amine, in which the mass fraction of Carbon is 38.7%

Derive the molecular formula of an amine, in which the mass fraction of Carbon is 38.7%, the mass fraction of Nitrogen is 45.1%, and Hydrogen is 16.2%.

Let m (compounds) = 100 g
then
m (C) = 38.7 g n (C) = 38.7 \ 12 = 3.225 mol
m (N) = 45.1 g n (N) = 45.1 \ 14 = 3.221 mol
m (H) = 16.2 g n (H) = 16.2 \ 1 = 16.2 mol
n (C): n (N): n (H) = 3.225: 3.221: 16.2 = 1: 1: 5
CNH5 simplest formula
CH3NH2 methylamine
Answer: CH3NH2