# An Unimaginatively named Chemistry Problem- Mole Concept.

Chemistry Level 2

Yawn what a boring name

A 10 gram sample of a mixture of Calcium Chloride and Sodium Chloride is treated with $$\ce{ Na2CO3 }$$ to precipitate the Calcium as Calcium Carbonate. This $$\ce{ CaCO3 }$$ is heated to convert all the Calcium to $$\ce{CaO}$$ and the final mass of $$\ce{CaO}$$ is 1.62 grams. What was the % by mass of $$\ce{CaCl2}$$ in the original mixture?