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:
% SiO2 = (0.69 g SiO2 / (0.69 g SiO2 + 1.05 g of cellulose + 2.17 g of calcium carbonate)) x 100% = 17.65% SiO2
