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 ) $
Show Answer
Answer:
Correct Answer: C
Solution:
- $ \Delta G{}^\circ =-,RT\text{ ln }K; $
$ \uparrow $ stability of reactant $ \downarrow $
