The thermal decomposition of calcium carbonate is described by
CaCO₃(s) ⇌ CaO(s) + CO₂(g)
At 900 K a 5.0 L rigid vessel containing excess solid CaCO₃ and CaO develops an equilibrium partial pressure of CO₂ equal to 0.049 atm.
Using only the information provided, address the tasks below.
(a) Calculate the molar concentration of CO₂(g) present at equilibrium.
(b) Determine the numerical value of Kc for the reaction at 900 K.