It is a unit of mass used for atoms and molecules, equal to 1/12 of the mass of an atom of Carbon -12. It is equal to 1.66033 x 10-21 kg.
The molecular mass, or atomic mass or formula mass of a substance expressed in grams is called Mole.
The total sum of protons and neutrons in the nucleus of an atom is called Mass Number and denoted by ‘A’.
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