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Question

Calculate the equation constant for the reaction: H2(g)+CO2(g)H2O(g)+CO at 1395 K, if the equilibrium constants at 1395 K for the following are
2H2O(g)2H2(g)+O2(g) K1= 2.1 × 1013
2CO2(g)2CO(g)+O2(g) K2= 1.4 × 1012

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Solution

2CO2(g)2CO(g)+O2(g);K2=1.4×1012
iiCO2(g)CO(g)+12O2(g);K12=(1.4×1012)12
2H2O(g)2H2(g)+O2(g);K1=2.1×1013
iH2(g)+12O2(g)H2O(g);K11=+(2.1×1013)12
H2(g)H2(g);K

K=K11×K21=+(2.1×1013)12×(1.4×1012)12
K=1.71×1012
Therefore, the equilibrium canstant for the given reaction is 1.71×1012.

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