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A sample of mixture of CaCl and NaCl weighing 4.22 gm was treated to precipitate all the Ca as CaCO3 which was then heated

A sample of mixture of CaCl and NaCl weighing 4.22 gm was treated to precipitate all the Ca as CaCO3 which was then heated and quantitatively converted to 0.959 gm of CaO. Calculate the mass percentage of CaCl in the mixture.

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