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Please, please ​answer and show steps for the questions! I will rate for you! A. How...

Please, please ​answer and show steps for the questions! I will rate for you!

A. How many grams of Na2CO3 are required to make 100.0 mL of 0.300M Na2CO3? (Show your work)

B. How many grams of CaCl2 are required to make 100.0 mL of 0.250M CaCl2 ? (Show your work)

C. A 0.510-g sample of calcium chloride reacts with excess sodium carbonate to give 0.366 g of calcium carbonate precipitate. What is the percent yield?

D. What would cause a percent yield of calcium carbonate that is greater than 100%? Explain.

E. A 0.995-g unknown mixture containing calcium chloride reacts to give 0.505 g of calcium carbonate precipitate. What is the percentage of calcium chloride in the unknown mixture?

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