When titrated in neutral solution with 0.05000 N I2, a mixture of As2O3, As2O5, and inert material requires 20.10 ml. The resulting solution is then acidified, and excess KI is added. The liberated I2 requires 29.92 ml of 0.1500 N NaS2O3 . Calculate the sum of the weights of As2O3 and As2O5 in the sample

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