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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.
Avogadro's number is the number of atoms required to make 1 gram of molecular hydrogen (not including the heavier isotopes of hydrogen). Sodium has a standard atomic weight of 22.99 amu (atomic mass units). A mole of Sodium atoms would weigh 22.99 grams.