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:

The answer to your question is below

Explanation:

Noble gases has  their levels of energy completed so they can not react with another element, they can not interchange electrons .

           electronic configuration

He               1 s ²

Ne               1s² 2s² 2p⁶

Ar                 [Ne] 3s² 3p⁶

Kr                 [Ar] 3d¹⁰ 4s² 4p⁶

Xe                [Kr] 4d¹⁰ 5s² 5p⁶

Rn                [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

In the electronic configurations we can see that Noble gases have 8 electrons in their outermost shell, so they do not need to react to be stable, they are stable.