The Element Oxygen Was Prepared by Joseph Priestley in 1774

question 93

Multiple Choice

The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide: HgO(s) → Hg(l) + ½O₂(g) , ΔH° = 90.84 kJ/mol. Estimate the temperature at which this reaction will become spontaneous under standard state conditions.

• A) 108 K
• B) 430. K
• C) 620. K
• D) 775 K
• E) 840. K

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