Joseph Priestley Discovered Oxygen in 1774 by Heating Mercury(II) Oxide

question 94

Multiple Choice

Joseph Priestley discovered oxygen in 1774 by heating mercury(II) oxide. The compound decomposes into its elements. How much oxygen, O₂, is produced by the decomposition of 25 g of HgO?

• A) 1.8 g
• B) 3.7 g
• C) 5.5 g
• D) none of these

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