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A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.491 M HCl. All the CaCO 3 reacts, releasing carbon dioxide gas

A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.491 M HCl.  
All the CaCO3 reacts, releasing carbon dioxide gas and leaving 250. mL of a clear solution.
20.00 mL of the solution is pipetted into another flask.
32.3 mL of 0.0580 M NaOH is required to titrate the HCl remaining in this 20.00-mL portion.  
What was the original mass of CaCO3 in the piece of chalk?

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