The thallium (present as tl2so4) in a 9.486-g pesticide sample was precipitated as thallium(i) iodide. calculate the mass percent of tl2so4 in the sample if 0.1824 g of tli was recovered.

The mass percentage of is 5.86%

Explanation:

To calculate the mass percentage of in the sample it is necessary to know the mass of the solute ( in this case), and the mass of the solution (pesticide sample, whose mass is explicit in the letter of the problem).

To calculate the mass of the solute, we must take the mass of the precipitate.  We can establish a relation between the mass of and using the stoichiometry of the compounds:

Since for every mole of Tl in there are two moles of Tl in , we have:

Using the molar mass of we have:

Finally, we can use the mass percentage formula: