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A smple of mixture of NaCl, Caco3 and SiO2 weighed 7.30 grams. During the water wash the sample lost 2.21 grams. After treatment with HCL, the sample weighed 2.05 grams.

a. What is the perecent of NaCL by mass in the sample?

b.What are the percentages of Caco3 and SiO2 by mass in the sample?

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