Chemical Thermodynamics Question 428

Question: Consider the $ \Delta {G^{{}^\circ }} _{f} $ and $ \Delta {{H}^{{}^\circ }} _{f}(kJ/mol) $ for the following oxides. Which oxide can be most easily decomposed to form the metal and oxygen gas-

Options:

A) $ ZnO( \Delta G{}^\circ =-318.4,\Delta H{}^\circ =-348.3 ) $

B) $ Cu_2O( \Delta G{}^\circ =-146.0,\Delta H{}^\circ =-168.8 ) $

C) $ HgO( \Delta G{}^\circ =-58.5,\Delta H{}^\circ =-90.8 ) $

D) $ PbO( \Delta G{}^\circ =-187.9,\Delta H{}^\circ =-217.3 ) $

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Answer:

Correct Answer: C

Solution:

  • $ \Delta G{}^\circ =-,RT\text{ ln }K; $

$ \uparrow $ stability of reactant $ \downarrow $



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