At a certain temperature, K_p for the dissociation of solid CaCO₃ is 4.5 × 10⁻² atm and for the reaction C(s) + CO₂(g) ⇌ 2CO(g), the K_p value is 2.0 atm. The pressure of carbon monoxide at this tempe

Question

At a certain temperature, K_p for the dissociation of solid CaCO₃ is 4.5 × 10⁻² atm and for the reaction C(s) + CO₂(g) ⇌ 2CO(g), the K_p 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

Prashant Kotian · Accepted Answer

Correct answer: B. The equilibrium decomposition of CaCO₃ buffers P_CO₂ at 4.5 × 10⁻² atm. For the second equilibrium, K_p = P_CO² / P_CO₂ = 2.0. So, P_CO² = 2.0 × 4.5 × 10⁻² = 9.0 × 10⁻² = 0.09. Thus, P_CO = √0.09 = 0.30 atm. Therefore, correct answer is B.

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