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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.
Finally, add all these together for the average atomic mass. Ex: Oxygen (3 isotopes) Percent occurrence Isotope Mass. 99.759 % 15.99491 amu. .037% 16.99913 amu. .204% 17.99916 amu (.99749)(15.99491) = 15.95632 amu. (.00037)(16.99913) = .0062897 amu.