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Lesson Summary. The atomic mass unit (AMU) is used by scientists to describe the mass of atoms. If you want to convert a mass in grams to AMU, all you need to do is divide by 1.660599 x 10^-24 g/AMU. To unlock this lesson you must be a Study.com Member. Create your account.
If the mass of a single 12 C atom is 12.000 amu, then one mole of these atoms would have a mass of 12.000 grams. By definition, a a mole of any substance contains the same number of elementary particles as there are atoms in exactly 12 grams of the C isotope of carbon.