ustration: 10 Calculate % of Ca, C, and O in Caco, Mol. mass = 40 + 12 + 48 = 100 1.

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( mathrm{CaCO}_{3} ) Molecular mass ( =100 mathrm{g} ) Mass% of element ( = ) (Mass of element ( / ) Mass of molecule) ( times 100 ) Mass percentage of Calcium ( =[(40 mathrm{g}) /(100 mathrm{g})] times 100=40 % ) Carbon ( =[(12 mathrm{g}) /(100 mathrm{g})] times 100=12 % ) Oxygen ( =[(16 times 3 mathrm{g}) /(100 mathrm{g})] times 100=48 % )

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