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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.
amu= 1/12 of the mass of a C-12 atom: Scientists define the atomic mass unit as a relative standard that was closer in size to atomic and subatomic masses. Are superscript 24, 25, and 26 and subscript 12, 12 and 12.