In a closed vessel at constant temperature, CaCO3(s) CaO(s) + CO2(g) is at equilibrium. If some more solid CaCO3 is added, the equilibrium pressure of CO2

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In a closed vessel at constant temperature, $CaCO X_{3} (s) CaO (s) + CO X_{2} (g)$ is at equilibrium. If some more solid $CaCO X_{3}$ is added, the equilibrium pressure of $CO X_{2}$

K_{p} = p_{CO X_{2}}

depends only on temperature. The amount of a pure solid does not change its activity, so adding more

CaCO X_{3}

leaves

p_{CO X_{2}}

the same.