Question

( 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 % )

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

Solution