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An Atom, as we know, consists of nucleons (protons and neutrons) and electrons, which. Molar mass refers to the mass of one mole of a substance (which could be an element or a compound). In simple words, atomic mass is the mass of an atom of an element. Tritium has three nucleons so it has an atomic mass of 3 and 6.02x10 23 (or 1 mole of) atoms of Tritium have a mass of 3g.īoron has eleven nucleons so it has an atomic mass of 11 and 6.02x10 23 (or 1 mole of) atoms of Boron have a mass of 11g. The Gold Book of the International Union of Pure and Applied Chemistry (IUPAC) defines atomic mass as rest mass of an atom in its ground state. Hydrogen has one nucleon so it has an atomic mass of 1 and 6.02x10 23 (or 1 mole of) atoms of Hydrogen have a mass of 1g.ĭeuterium has two nucleons so it has an atomic mass of 2 and 6.02x10 23 (or 1 mole of) atoms of Deuterium have a mass of 2g.