# The thallium (present as #Tl_2SO_4#) in a #9.486# g pesticide sample was precipitated as Thallium(I) iodide. Calculate the mass percent of #Tl_2SO_4# in the sample if #0.1824# g of #TlI# was recovered?

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Help is much appreciated.

Help is much appreciated.

##### 1 Answer

The mass percent of

#### Explanation:

**Step 1. Write an equation for the reaction**

A partial equation for the reaction is

We don’t know what the other reactants and products are.

However, that doesn't matter as long as atoms of

**Step 2. Calculate the moles of #"TlI"#**

**Step 3. Calculate the moles of #"Tl"_2"SO"_4#**

**Step 4. Calculate the mass of #"Tl"_2"SO"_4#**

**Step 5. Calculate the mass percent of #"Tl"_2"SO"_4#**

I hope that helps!