What is the difference between molecular weight and relative molecular mass, atomic weight and relative atomic mass?

What is the difference between molecular weight and relative molecular mass, atomic weight and relative atomic mass?

If there is any difference, the one with "relative" refers to the ratio of the mass of a specific atom or molecule to carbon. The one without "relative" is the average relative atomic mass of all isotopes of this element

Why is the mass of 1 mol matter equal to its relative molecular weight or atomic weight?

First of all, the relative atomic weight is 1 / 12 of the mass of a C-12 atom as a unit quantity standard. The value of the mass of an atom of other elements compared with this standard is the relative atomic weight of the atom. For example, hydrogen is 1; oxygen is 16. Secondly, the mass of 1 mol hydrogen atom is 1 g, which is exactly equal to the relative atomic weight of hydrogen atom

Molecular weight atomic weight
What are molecular weight and atomic weight?

Molecular weight is the mass of all atoms in a molecule. Atomic weight is the mass of a single atom. Of course, these masses are relative masses

The mass of an iron atom is AKG, the mass of a carbon-12 atom is bkg, and the ratio of magnesium atomic weight to iron atomic weight is 3 ∶ 7

Let the atomic weight of Mg be c
C/1/12B:A/1/12B=3:7
C:A=3:7
7C=3A
C=3/7A