What amount of a substance is contained in monatomic hydrogen weighing 1 g? in diatomic hydrogen weighing 2 g?

In the SI system, the unit for measuring the amount of a substance is 1 mol, that is, the amount of a substance that contains the same number of atoms or molecules as atoms contains 0.012 kg of carbon 12.

The mass of one mole of a substance M (molar mass) is equal to the product of the relative molecular mass of molecules or atoms of a substance by a factor of 0.001 kg.

Molar mass of monoatomic hydrogen М₁:
М₁ = 1 о. but. m * 0.001 kg = 0.001 kg / mol.
Molar mass of diatomic hydrogen М₂:
М₂ = 2 о. m.m. * 0.001 kg = 0.002 kg / mol.
The amount of substance n₁ in monoatomic hydrogen with a mass in m₁ = 1 g (0.001 kg):
n₁ = M₁ / m₁ = 0.001 kg / 0.001 kg / mol = 1 mol.
The amount of substance n₂ in monoatomic hydrogen with a mass in m₂ = 2 g (0.002 kg):
n₂ = M₂ / m₂ = 0.002 kg / 0.002 kg / mol = 1 mol.
Answer: Both 1 g of monoatomic hydrogen and 2 grams of diatomic hydrogen contain the same amount of substance – 1 mol.