\(200 \mathrm{~cm}^{3}\) of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was \(158 \mathrm{~cm}^{3}\). Estimate the percentage of oxygen in the air.

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\(200 \mathrm{~cm}^{3}\) of air was passed over heated copper in a syringe several ...

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