Solution stoichiometry question?

Hydrochloric acid (HCl) reacts with sodium carbonate (Na2CO3), forming sodium chloride (NaCl), Water (H2O), and Carbon Dioxide (CO2). This balance equation is 2HCL(aq)+Na2CO3(aq)--->2NaCl(aq)+H2O(l)+CO2(g) 1. What volume of 2.75 M HCL in liters is needed to react completely (with nothing left over) with... show more Hydrochloric acid (HCl) reacts with sodium carbonate (Na2CO3), forming sodium chloride (NaCl), Water (H2O), and Carbon Dioxide (CO2). This balance equation is 2HCL(aq)+Na2CO3(aq)--->2NaCl(aq)+H2O(l)+...

1. What volume of 2.75 M HCL in liters is needed to react completely (with nothing left over) with 0.750 L of 0.200 M Na2CO3?

2. A 443 mL sample of an unknown HCl solution reacts completly with Na2CO3 to form 11.1 grams of CO2. What is the concentration of the HCl solution?

Any help or explanations would be greatly appreciated. I have lots of questions like these and need an example! Thank you!
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