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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.
To convert grams to AMU all you need to do is divide the quantity in grams by 1.660599 * 10^-24. Let's run through an example: Convert five grams of Na (Sodium) to AMU: So, to convert from grams to AMU, we simply divide the amount of sodium (in grams) by 1.660599 x 10^-24. In doing so, we end up with 3.01 x 10^24 AMU.