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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.
12 grams of carbon contain one Avogadro's number of atoms. Avogadro's number is approx. Because both amu and grams are units of mass, if you do a dimension analysis on [math]12 \mathrm{amu} \cdot 1.66 \cdot 10^{-24} \mathrm{g}[/math] you'll notice that it's mass squared, not mass.