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At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO2 in equilibrium with solid carbon has 90.55% CO by mass 

Calculate Kc for this reaction at the above temperature. 

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Let the total mass of the gaseous mixture be 100 g. 

Mass of CO = 90.55 g 

And, mass of CO2 = (100 – 90.55) = 9.45 g 

Now, number of moles of CO, 

Number of moles of CO2,

 Partial pressure of CO, 

Partial pressure of CO2, 

For the given reaction, ∆n = 2 – 1 = 1 

We know that

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