- Gram atomic mass is the mass, in grams, of one mole of atoms in a monatomic chemical element.
- It is numerically equal to the relative atomic mass (or atomic weight) in grams. The atomic mass of an element expressed in grams is called gram atomic mass.
- For example, oxygen is 16 grams.
- Atomic mass of an element expressed in grams is called gram atomic mass. Atomic mass unit (a.m.u) is the quantity of mass equal to 1/12th of the mass of an atom of carbon (C-12).