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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.
Chapter 8. Chemical Composition. Atomic mass unit (amu) : a unit of the scale relative masses of atoms (1 amu = 1.66Ã10 -24 g). Atomic weight (Atomic mass) : the atomic weight of an element given in the periodic table is. a weighted average of the masses (in amu) of its isotopes found on the earth.