The answer is: 3) 10.
In this chemical compound dimethylamine (CH₃)₂NH, there are two carbon atoms (C), seven hydrogen atoms (H) and one nitrogen atom (N).
Total number of atoms is = 2 + 7 + 1.
Total number of atoms is = 10.
In one mole of dimethylamine there are 10 moles of atoms.
Dimethylamine is an organic compound; this secondary amine is a colorless, flammable gas with an ammonia like odor.