A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with N a 2 C O 3 to precipitate the calcium as calcium carbonate. This C a C O 3 is heated to convert all the calcium to

Question

A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with N a 2 C O 3 to precipitate the calcium as calcium carbonate. This C a C O 3 is heated to convert all the calcium to CaO and the final mass of CaO is 1.62 gms. The % by mass of C a C l 2 in the original mixture is

TestHub · Accepted Answer

Moles = Weight in gm Molecular weight Moles of CaO = 1 .62 56 Moles of C a C l 2 = 1.62 56 Mass of CaCl 2 = 1 .62 56 × 111 = 3 .21 gm Mass % = Weight in gm Total weight given × 100 % of C a C l 2 = 3.21 10 × 100 = 32.1 %

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