(a)
The equilibrium constant obtained from the equilibrium reaction at 298 K.
(a)

Answer to Problem 27P
The equilibrium constant obtained from the equilibrium reaction at 298 K is
Explanation of Solution
Express the standard-state Gibbs function change.
Here, the Gibbs function of components
Write the equation to calculate the natural logarithms of equilibrium constant for the chemical equilibrium of ideal-gas mixtures.
Here, universal gas constant is
Write the equation to calculate the equilibrium constant for the chemical equilibrium of ideal-gas mixtures.
Conclusion:
From the equilibrium reaction, the values of
Refer to Table A-26; obtain the values of
Substitute 1 for
Substitute
Substitute
Thus, the equilibrium constant obtained from the equilibrium reaction at 298 K is
The value obtained for equilibrium constant at 298 K from the definition of the equilibrium constant is
(b)
The equilibrium constant obtained from the equilibrium reaction at 1800K.
(b)

Answer to Problem 27P
The equilibrium constant obtained from the equilibrium reaction at 1800Kis
Explanation of Solution
Write the expression to obtain standard-state Gibbs function change.
Here, the Gibbs function of components
Write the equation to calculate the natural logarithms of equilibrium constant for the chemical equilibrium of ideal-gas mixtures.
Here, universal gas constant is
Write the equation to calculate the equilibrium constant for the chemical equilibrium of ideal-gas mixtures.
Conclusion:
From the equilibrium reaction, the values of
Refer Table A-26, obtain the values of
Refer Table A-22, obtain the value of
Refer Table A-22, obtain the value of
Refer Table A-19, obtain the value of
Refer Table A-19, obtain the value of
Refer Table A-23, obtain the value of
Refer Table A-23, obtain the value of
Substitute 1 for
Substitute
Substitute
Thus, the equilibrium constant obtained from the equilibrium reaction at 1800Kis
The value obtained for equilibrium constant at 1800K from the definition of the equilibrium constant is
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Chapter 16 Solutions
THERMODYNAMICS: ENG APPROACH LOOSELEAF
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