Mass percentage is another way of expressing concentration of a substance in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%. It is calculated as follows:
% CaCO3 = (1.82g of calcium carbonate / (1.05 g SiO2 + 0.69 g of cellulose + 1.82g of calcium carbonate)) x 100% = 51.12% Calcium carbonate
