How many maoles of `O_3` is required for oxidation of one mole of PbS.
`PbS + 4O_3 to PbSO_4 + 4O_2`.

Explanation

To determine how many moles of ozone (O₃) are required to oxidize one mole of lead sulfide (PbS), we can refer to the given chemical reaction:

\[ \text{PbS} + 4 \text{O}_3 \rightarrow \text{PbSO}_4 + 4 \text{O}_2 \]

### Step-by-Step Solution:

1. **Identify the Reaction**: The balanced chemical equation shows that one mole of PbS reacts with four moles of O₃ to produce one mole of PbSO₄ and four moles of O₂.

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