Solid calcium carbonate decomposes according to
CaCO₃(s) ⇌ CaO(s) + CO₂(g)
A 4.00 L rigid container at 900 K is charged with excess CaCO₃(s) and CaO(s). At equilibrium, 0.0440 mol of CO₂(g) is present. (R = 0.0821 L·atm·mol⁻¹·K⁻¹)
Calculate both K_p and K_c for this equilibrium at 900 K.