3. To 3 l of a solution of nitric acid with a mass fraction of HNO3 of 10% and a density of 1.054 g/ml was added 5 l of a solution of nitric acid with a mass fraction of HNO3 of 2% and a density of 1.009 g/ml. Calculate the mass fraction of HNO3 and the molar concentration in the resulting solution, the volume of which is 8 liters.

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