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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.
Hydrogen has an atomic mass of 1.01 atomic mass units. An atomic mass unitis TINY. One gram is equal to about 600000000000000000000000 amu (or 6followed by 23 zeros). So, because the mass of hydrogen is close to 1 amu,1 gram of hydrogen contains about that same huge number of atoms.