Question 23 Calculate the equilibrium constant at 122 K for the thermodynamic da

Question

Question 23 Calculate the equilibrium constant at 122 K for the thermodynamic data in the previous question. Notice that Keq is larger at the larger temperature for an endothermic reaction. Question 24 Endothermic reaction; increase in entropy Calculate the equilibrium constant at 20 K for a reaction with delta H degree = 10 kJ and delta S degree = 100 J/K. Question 25 Calculate the equilibrium constant at 146 K for the thermodynamic data in the previous question. Notice that Keq is dramatically larger for a larger temperature when there is a substantial positive increase in entropy.

Explanation / Answer

24) delta G0 = delta H0 - T*delta S0 = 10000 - 20*100 = 8000 J

Now, delta G0 = -R*T*lnKeq

or, 8000/(8.314*20) = -lnKeq

or, Keq = 1.27*10-21

25) delta G0 = delta H0 - T*delta S0 = 10000 - 146*100 = -4600 J

Now, delta G0 = -R*T*lnKeq

or, 4600/(8.314*20) = lnKeq

or, Keq = 44.26

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