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Atomic Mass of An Element. Unit: amu, atomic mass unit = 1/12 of a 12C atom12C : 12.00 amu 7Li : 7.016 003 amu14N : 14.003 074 01 amuMost elements occur in nature as a mixture of isotopesWeighted average from all isotopesCl : 6.941 amu ( 7.42% 6Li 92.58 % 7Li). Molar Mass of an
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