A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask.

How many moles of CaCO3 are used?

What is the molarity of the Ca2+ in the 250 mL of solution?
How many moles of Ca2+ ae in a 25.0 mL aliquot of the unknown solution from question 2?

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