29. A 0.1260 g sample of a medicinal product containing paracetamol (C8H9NO2) and indifferent impurities was dissolved in anhydrous acetic acid, ethanol was added and 0.091 mol was titrated with a solution of perchloric acid in glacial acetic acid. Calculate the mass fraction of paracetamol in the product based on the following titration results
V(HClO4), ml 3.80 4.00 4.20 4.40 4.60 4.80 5.00 5.20
E, mV 355 360 382 523 579 597 611 620

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