# The molar mass of the nitrogen compound with hydrogen is 32 g / mol, and the mass fraction of nitrogen atoms in it is 87.5%

The molar mass of the nitrogen compound with hydrogen is 32 g / mol, and the mass fraction of nitrogen atoms in it is 87.5%. Determine the molecular formula of a substance Decision:
Ar (H) = 1 g / mol;
Ar (N) = 14 g / mol.
We determine the mass of the nitrogen element in 32 g of the substance from the proportion, we get:
32: 100 = x: 87.5;
x = (32. 87.5) / 100 = 28 g.
m (N) = 28 g.
Then
m (H) = 32 – 28 = 4 g.
We denote the index of the nitrogen atom by x, and the index of hydrogen atoms by y in the substance’s molecule, we obtain the formula of the substance:
the oxide formula can be represented as follows: NxHy.
We find the indices of atoms in the NxHy molecule
You can write it like this:
x: y = m (N) / Ar (N): m (H) / Ar (H) = 28/14: 4/1 = 2: 4.
Substitute the values of the indices in the formula, we get:
NxHy = N2H4, this is hydrazine Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.