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For CaCO3(s) to CaO(s) + CO2(g), the equilibrium constant Kp equals
A1 / partial pressure of CO2
Bthe partial pressure of CO2
Cp(CaO) x p(CO2) / p(CaCO3)
Dthe total moles of the solids
Answer & Solution
Correct answer: B. the partial pressure of CO2
Pure solids have constant activity and drop out of the expression, leaving Kp = pCO2.
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