Chemistry - Mole Concept Question with Solution | TestHub

A 10.0 gram sample of a mixture of calcium chloride and sodium chloride is treated with ${\mathrm{Na}}_2{\mathrm{CO}}_3$. The precipitate formed is decomposed on heating. The weight of the residue is 1.68 gram. The percentage by mass of ${\mathrm{CaCl}}_2$ in the original mixture is : (Round off to nearest integer)

(Cl = 35.5, Ca = 40; Na = 23, C =12, O = 16)