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A 25ml sample of solution containing thallium(I) (TI) was treated with K2CrO4 to perticipate thallium chromate. The solid TI2CrO4 was filtered, washed to remove excess chromate, and then dissolved in dilute H2SO4. The dicromate (Cr2O7-2) produced was titrated with 40.60ml of 0.1004M Fe2+ solution. What was the mass (g) of TI (element 81)in the sample?

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