# O KINETICS AND EQUILIBRIUM Writing the pressure equilibrium expression for a heterogeneous equilibrium Write the pressure...

O KINETICS AND EQUILIBRIUM Writing the pressure equilibrium expression for a heterogeneous equilibrium Write the pressure equilibrium constant expression for this reaction. CaO(s)+CO2(g) +CaCO3(s) x S ?

explanation:

we write the equillbria-

CaO(s) + CO2(g) <=====> CaCO3 (s),

Let us consider,

p[CaO] = partial pressure of CaO

p[CO2] = partial pressure of CO2.

p[CaCO3] = partial pressure of CaCO3.

Then pressure equillbirium constant expression ,Kp can be written as:

Kp = p[CaO(s)]*p[CO2(g)]/p[CaCO3 (s)]

Since , activities of solids and liquids are unity ,and then the partial pressure should also be omitted from above expression, therefore,

Kp = 1/[CO2 (g)]

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