The absolute atomic mass is a very small number and it is not convenient to use it. To facilitate the calculations, they came up with a relative atomic mass. It is equal to 1/12 the mass of a carbon atom. This unit is precisely defined and equals 1.66 * 10-24 grams.
The relative atomic mass of a chemical element shows how many times the mass of an atom of a chemical element is more than 1/12 of the mass of a carbon atom.
To convert the relative mass of an atom into an absolute one, you need to multiply the atomic mass taken from the periodic table by 1.66 * 10-24 grams.
To convert the absolute mass of an atom into a relative one, it must be divided by 1.66 * 10-24 grams.
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