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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?

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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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Correct answer: (c) HgO (ΔG° = -58.5, ΔH° = -90.8)

Explanation:

ΔG° = – RT ln K ;

K ↑ stability of reactant ↓­

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