Chemical EquilibriumMedium

Question

At a certain temperature, KP for the dissociation of solid CaCO3 is 4.5 × 10–2 atm and for the reaction

C(s) + CO2(g) $\rightleftharpoons$2CO(g), the KP value is 2.0 atm. The pressure of carbon monoxide at this temperature, when solid carbon CaO and CaCO3 are mixed together and allowed to attain equilibrium is

Options

A.0.09 atm
B.0.30 atm
C.2.1 atm
D.0.47 atm

Solution

CaCO3(s)$\rightleftharpoons$ CaO(s) + CO2(g); Kp = 4.5 × 10–2 atm

C(s) + CO2(g) $\rightleftharpoons$2CO(g); Kp = 2.0 atm

On adding,

CaCO3(s) + C(s) $\rightleftharpoons$CaO(s) + 2CO(g);

Kp = 9 × 10–2 atm2

or PCO2 = 9 × 10–2 ⇒ PCO = 0.3 atm

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