7. An ampoule containing 1.200 g of HNO3 solution was broken in a NaOH solution with a volume of 30.0 cm3 and a concentration of 0.800 mol/dm3. The remainder of the alkali that did not enter into the reaction was titrated with 20.0 cm3 of 0.500 mol/dm3 of HCl. Calculate the mass fraction of HNO3 in the solution.

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