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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.
Molar Mass is how much one mole weighs of a particular compound. You can have a mole of hydrogen and a mole of helium but the mole of helium is going to way twice as much because a hydrogen has 1 proton+neutron whereas the helium has 2 proton+neutron pairs. The AMU is a unit of mass measurement on the atomic scale. 1 mole of 1 AMU weights out to 1 gram. By knowing the AMU of an atom or compound you automatically know its molar mass.