Chemical Thermodynamics Question 483

Question: The Solvay process for making $ Na_2CO_3 $ involves the reaction

$ 2NaHCO_3Na_2CO_3(s)+H_2O(g)+CO_2(g) $

For this reaction $ \Delta H^{o}=129.2,kJ/mol, $

$ \Delta S^{o}=334.2,J/mol-K $ . From this information, the minimum temperature at which this reaction becomes spontaneous is:

Options:

A) $ 460{}^\circ C $

B) $ 1017{}^\circ C $

C) $ 113{}^\circ C $

D) the reaction is spontaneous at all temperatures

Show Answer

Answer:

Correct Answer: C

Solution:

  • At $ 113^{o}C,\Delta G^{o}=0 $


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