Please help chemistry!?

Posted on 2015-12-02 07:30:00 in Chemistry by PIALO

Hydrochloric acid (HCl ) reacts with sodium carbonate (Na 2 CO 3 ), forming sodium chloride (NaCl ), water (H 2 O ), and carbon dioxide (CO 2 ). This equation is balanced as written:
2HCl(aq)+Na 2 CO 3 (aq)?2NaCl(aq)+H 2 O(l)+CO 2 (g)

Part A

What volume of 2.75 M HCl in liters is needed to react completely (with nothing left over) with 0.250 L of 0.500 M Na 2 CO 3 ?

Part B

A 701-mL sample of unknown HCl solution reacts completely with Na 2 CO 3 to form 11.1 g CO 2 . What was the concentration of the HCl solution?

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