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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 (atomic mass unit) : the standard unit of measurement of atomic mass. The mass of one carbon-12 atom is set at 12 amu; the atomic mass of atoms of all other elements is determined relative to the mass of carbon-12. Avogadroâs number : the number of units in one mole: 6.022 Ã 1023, which is the number of atoms in 12 grams of carbon-12. molar mass : the mass of one mole of a substance, measured in grams.