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A 9.89 g sample of an aqueous solution of nitric acid contains an unknown amount of...

A 9.89 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid.
If 17.8 mL of 0.906 M barium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture?

% by mass

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