Consider the reaction CaCO3 (s) - -> CaO (s) + CO2 (g)

calculate the equilibrium constant for this reaction at 298.15K.

Kc = [CO2], that is to say it is equal to the concentration of CO2

Explanation:

It is a heterogeneous equilibrium since the substances that participate in the reaction are in different phases

In the heterogeneous limestone decomposition reaction:

CaCO3 (s) - -> CaO (s) + CO2 (g)

The equilibrium constants are:

Kc = [CO2 (g) ]; Kp = PCO2 (g); Kc = Kp (R T) ^ - (1-0) = Kp (R T) ^ - 1

The equilibrium situation is not affected by the amount of solid or liquid, as long as these substances are present.

The equilibrium constant is independent of the amounts of solids and liquids in equilibrium.