By dissolving a sample of AI(NO3)3*n H2O weighing 1.703 g, 200.0 cm3 of solution was prepared, and an excess of Na2MgY pasture was added to 20.00 cm3 of it (where Y is the symbol of complexone III). 17.45 cm3 of 0.02507 M complexone III was used for titration of the released Mg2. Calculate the mass fraction of AI(NO3)3 in the preparation.
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