In 1774 Joseph Priestley Prepared the Element Oxygen by Heating

question 25

Multiple Choice

In 1774 Joseph Priestley prepared the element oxygen by heating mercury(II) oxide: HgO(s) → Hg(l) + ½O2(g)
For this reaction, ΔH° = 90.84 kJ and ΔS° = 108 J/K. Which of the following statements is true?

• A) The reaction is only spontaneous at low temperatures.
• B) The reaction is spontaneous at all temperatures.
• C) ΔG° becomes less favorable as the temperature is raised.
• D) The reaction is spontaneous only at high temperatures.
• E) The reaction is spontaneous under standard conditions at 25°C.

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