The atomic masses of any two elements contain the same number of atoms.
From Avogadro's law, the number of atoms in an element is given by Avogadro's number which is 6.02 × 10^23 atoms. According to this law, all substances are composed are composed of the same number of elementary entities.
Since elements are composed of atoms, the atomic mass of an element is the mass of one mole of that element. Hence one mole of any two elements contains 6.02 × 10^23 atoms.
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