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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.
Average atomic weight = 26.4 amu + 9.05 amu = 35.5 amu. Notice that the average is determined by the more abundant Chlorine-35. Because chlorine-35 is more common, the average is closer to 35 amu than 37 amu. Clearly no atoms of chlorine actually have a mass of 35.5 amu.The tabulated value in the periodic table is a statistical creation and matches no real chlorine atoms at all.ecause chlorine-35 is more common, the average is closer to 35 amu than 37 amu. Clearly no atoms of chlorine actually have a mass of 35.5 amu. The tabulated value in the periodic table is a statistical creation and matches no real chlorine atoms at all.