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    Find the mass percent of Tl2SO4.

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    The thallium (present as Tl2SO4) in a 7.80-g pesticide sample was precipitated as thallium(I)iodide. Calculate the mass percent of Tl2SO4 in the sample if 0.890g of TlI was recovered.

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    Molecular wt. of TII =204.3+126.9 = 331.2
    Molecular wt. of TI2SO4 = 2*204.3 +96 ...

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