How to find the mass percentage in a mixture?

Ca= 1x40.08=40.08

C=1x12.01=12.01

O=3x16.00=48.00

you add all these up 100.09 then you round and you can only have 4 sig figs, 100.1

now divide ca by 100.1 adn so on the rest is a blur to me

volume of NH4Cl + volume of NaCl + volume of SiO2 = 100g because of the fact they're all equivalent by using mass p.c., all of them equivalent to 33.33% of the mixture Mass p.c. is calculated as as a result: (Mass of Compound / finished Mass of combination) * a hundred = 33.33 the completed mass of the mixture is 100g (Mass of Compound / 100g )*a hundred =33.33 The a hundred's cancel to bypass away: Mass of Compound = 33.33 for each this means that each and all the three components is 33.33 grams to locate the quantity of chlorine you may desire to take the 33.33 gram to mols for each using the formula weight i will do NH4Cl NH4Cl formula weight = fifty 3.5 g/mol 33.33 grams/ (fifty 3.5 g/mol) = 0.6230 mols NH4Cl there is one mol of Cl for all and sundry mol of NH4Cl as a result you have 0.6230 mol of Cl which using molar mass of 35.5 g/mol = 22.12g of Cl from the NH4Cl Do a similar for NaCl SiO2 isn't important because it has no Chlorine (the completed form of grams of Cl from NH4Cl and NaCl / the completed combination mass, 100g) *a hundred = your answer