4. A 1.3900 g sample of technical Na2SO3 was dissolved in a 200.00 ml volumetric flask. 15.90 ml of I2 solution with a normality of 0.04956 N was added to an aliquot of 20.00 ml. The mass fraction in the sample is: 2) 34.66; 3). 35.71; 4) 31.22; 5) 34.97; 6) 38.60.

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