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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 put this in different words, 1 amu is equal to 1/12 the mass of a carbon-12 atom, which has a mass of exactly 12 amu. For another example, a normal helium atom has 2 electrons, 2 protons, and 2 neutrons. Because each proton and each neutron weights one amu, a normal helium atom weighs 4 amu.