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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.
expressed in unified atomic mass unit, amu However, for practical purposes in the laboratory the relative atomic mass is used so the unit would be gram. (Relative atomic mass â¦ compares the mass of all elements to that of the carbon-12 isotope taken as exactly 12). 3 people found this useful. Answered.