From the given data of equilibrium constants of the following reactions, CaO(s)+H2(g)⇌Ca(s)+H2O(g);K=60 CaO(s)+CO(g)⇌Ca(s)+CO2(g);K=400 Calculate the equilibrium constant of the reaction, CO2(g)+H2(g)⇌CO(g)+H2O(g)
A
0.15
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B
1.5
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C
2.5
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D
0.25
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Solution
The correct option is A 0.15 CaO(s)+H2(g)⇌Ca(s)+H2O(g);K1=60−(1) CaO(s)+CO(g)⇌Ca(s)+CO2(g);K=400−(2) Now substracting the equation (2) from Equation (1), we get CO2(g)+H2(g)⇌CO(g)+H2O(g);K=? The equilibrium constant (k) can be written as K=K1K2 =60400=0.15