In 1774 Joseph Priestly Prepared Oxygen by Heating Mercury(II) Oxide

question 50

Multiple Choice

In 1774 Joseph Priestly prepared oxygen by heating mercury(II) oxide according to the reaction HgO(l) <----> Hg(l) + ½O₂(g) , for which ΔH^o = 90.84 kJ/mol and ΔS^o = 108 J/K.mol. Which of the following statements is true for this reaction?

• A) The reaction is spontaneous only at low temperatures.
• B) The reaction is spontaneous at all temperatures.
• C) ΔG^o becomes less favorable as temperature increases.
• D) The reaction is spontaneous only at high temperatures.
• E) The reaction is at equilibrium at 25^oC and 1 atm pressure.

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