Question
Asked Jul 31, 2019
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For the reaction

4HCl(g) + O2(g)2H2O(g) + 2Cl2(g)

H° = -114.4 kJ and S° = -128.9 J/K

The equilibrium constant for this reaction at 262.0 K is ______

Assume that H° and S° are independent of temperature

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Expert Answer

Step 1

The Gibbs Helmholtz equation is given as,

ΔGΔΗ-ΤASo
Where, AGo change in Gibbs free energy
AH change in enthalpy
change in entropy
ASo
T temperature
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ΔGΔΗ-ΤASo Where, AGo change in Gibbs free energy AH change in enthalpy change in entropy ASo T temperature

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Step 2

The Gibbs free energy can be calculated as,

AG° = -114400 J- (262 K x -128.9 J/K)
AGo -80628.2 J
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AG° = -114400 J- (262 K x -128.9 J/K) AGo -80628.2 J

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Step 3

The equilibrium constant (Keq) ca...

AG° = -RT In Keq
-80628.2 (-8.314 x 262) In Keq
Keq 1.189 x 1016
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AG° = -RT In Keq -80628.2 (-8.314 x 262) In Keq Keq 1.189 x 1016

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