A 12.8 g sample of an aqueous solution of hydrochloric acid contains an unknown amount of the acid. If 20.4 mL of 0.634 M sodium

Question

A 12.8 g sample of an aqueous solution of hydrochloric acid contains an unknown amount of the acid. If 20.4 mL of 0.634 M sodium hydroxide are required to neutralize the hydrochloric acid, what is the percent by mass of hydrochloric acid in the mixture?

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