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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.
If it is not clear from the context that g/mol is the desired answer, go with amu (which means atomic mass unit). This problem can also be reversed, as in having to calculate the isotopic abundances when given the atomic weight and isotopic weights.