22. A sample of 2.040 g of technical Na2S was dissolved in water in a 500 ml volumetric flask. 50 ml of a 0.0568 N solution of I2 was added to 20 ml of the solution. The excess iodine was titrated with 15 ml of a 0.0476 N solution of Na2S2O3. What is the content (in %) of Na2S in the sample?

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