The mass fractions of carbon, hydrogen and nitrogen in e are 38.71, 16.13 and 45.16%, respectively. The substance

The mass fractions of carbon, hydrogen and nitrogen in e are 38.71, 16.13 and 45.16%, respectively. The substance has the formula: I) CHhNn. 2) CaНsNH2 4) Cable NH

We denote the unknown indices by x, y, z, we get CxHyNz.
Let’s compose the ratio of the mass fraction to the molar mass of the elements.
Cx: Hy: Nz = (WC: MC): (WH: MH): (WN: MN).
Cx: Hy: Nz = (38.71: 12): (16.13: 1): (45.16: 14).
Cx: Hy: Nz = 3.23: 16.13: 3.23.
Divide by the smallest value to get an integer.
Cx: Hy: Nz = 1: 5: 1.
The given substance has the formula CH5N – it is methylamine.