What is the molarity of a hydrochloric acid solution if 20.00 mL of HCl is required to

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What is the molarity of a hydrochloric acid solution if 20.00 mL of HCl is required to neutralize 0.424 g of sodium carbonate (105.99 g/mol)?

2 HCl(aq) + Na2CO3(aq) → 2 NaCl(aq) + H2O(l) + CO2(g) 

(a) 0.100 M

(b) 0.200 M

(c) 0.300 M

(d) 0.400 M

(e) 0.500 M.

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