The Element Oxygen Was Prepared by Joseph Priestley in 1774 $\rarr$

question 8

Multiple Choice

The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(II) oxide: HgO(s) $\rarr$ Hg(l) + ¹/₂O₂(g) , $\Delta$ H° = 90.84 kJ/mol.
Estimate the temperature at which this reaction will become spontaneous under standard state conditions.
S°(Hg) = 76.02 J/K·mol
S°(O₂) = 205.0 J/K·mol
S°(HgO) = 70.29 J/K·mol

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

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