162. A sample of chemically pure As2O3 weighing 0.8500 g was dissolved in alkali, placed in a 200.00 cm3 flask, then the solution was acidified. How many cm3 of KBrO3 solution with T(KBrO3) = 0.002250 g/cm3 was used for titration of 20.00 cm3 of As2O3.

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