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(A) Aqueous $HNO_3$ forms a constant boiling mixture (azeotrope) with water at a concentration of approximately $68\%$ by mass. Distillation of dilute

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$68$

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(A) Aqueous $HNO_3$ forms a constant boiling mixture (azeotrope) with water at a concentration of approximately $68\%$ by mass. Distillation of dilute $HNO_3$ results in the concentration of the acid up to this limit,after which the composition of the vapor becomes identical to that of the liquid,preventing further concentration by simple distillation.

What is the approximate percentage by mass of aqueous $HNO_3$ that can be obtained by distillation (in $\%$)?

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