A sample of mixture of CaCl2, and NaCl weighing 4.22 g was treated to precipitate all the Ca as Caco3, which was then heated and quantitatively converted to 0.959 g of Cao. Calculate the percentage(by mass) of CaCl, in the mixture.

A sample of mixture of CaCl2, and NaCl weighing 4.22 g was treated to

1.	A sample of mixture of CaCl2, and NaCl weighing 4.22 g was treated to precipitate all the Ca as Caco3, which was then heated and quantitatively converted to 0.959 g of Cao. Calculate the percentage(by mass) of CaCl, in the mixture.
Answer» CA present in 1.68 g CaO is 1.2 g.So, original mixture has 1.2 g Ca means =1.2 × 111/40 =3.33 g CCaCl2.Hence, MASS percent of CCaCl2. = 33.3/5.55 ×100 =60 %. ANS.