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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.
+ Atomic Mass ï® Special mass unit for measuring mass of an atom ï® Atomic Mass Unit (AMU) ï® Also referred to as a Dalton (Da) ï® AMU is defined as â 1/12 the mass of Carbon-12 ï® Proton = ~1 amu ï® Neutron = ~1 amu ï® Electron = not counted.