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

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