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The Atomic Mass unit (amu) is defined to be exactly 1/12 of the mass of a C-12 atom (Not a mole of carbon atoms...) Therefore 1 C-12 atom has a mass of exactly 12.00000000 amu. Also, therefore, 1 amu is a very small unit of mass - specifically 1amu = 1.66053X10^-24 grams. 1.00 mole of C-12 atoms has a mass of 12.0000000 grams!

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14y ago

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