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04/10/2021 4:38 pm
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Consider the ΔG°f and ΔH°f (kJ/mol) for the following oxides. Which oxide can be most easily decomposed to form the metal and oxygen gas?
(a) ZnO (ΔG° = – 318.4, ΔH° = -348.3)
(b) Cu2O (ΔG° = -146.0, ΔH° = -168.8)
(c) HgO (ΔG° = -58.5, ΔH° = -90.8)
(d) PbO (ΔG° = -187.9, ΔH° = -217.3)
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04/10/2021 4:41 pm
Correct answer: (c) HgO (ΔG° = -58.5, ΔH° = -90.8)
Explanation:
ΔG° = – RT ln K ;
K ↑ stability of reactant ↓