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

Question 25

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) , Δ\Delta H \circ = 90.84 kJ/mol.Estimate the temperature at which this reaction will become spontaneous under standard state conditions.S \circ (Hg) = 76.02 J/K·mol
S \circ (O2) = 205.0 J/K·mol
S \circ (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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