Final answer:
The equilibrium constant for the reaction Ca(HCO₃)₂(s) ⇌ CaO(s) + 2 CO₂(g) + H₂O(g) is Kc = [CaO][CO₂]²[H2O]/[Ca(HCO₃)₂].
Step-by-step explanation:
The equilibrium constant for the reaction Ca(HCO₃)₂(s) ⇌ CaO(s) + 2 CO₂(g) + H₂O(g) is given by option a. Kc = [CaO][CO₂]²[H2O]/[Ca(HCO₃)₂].
The equilibrium constant expression is determined by the coefficients in the balanced chemical equation. The equilibrium constant (Kc) is expressed by the concentrations of the products divided by the concentrations of the reactants, with each concentration raised to the power of its coefficient in the balanced equation. In this case, the concentrations of CaO, CO₂, and H₂O are raised to the power of 1, 2, and 1 respectively, and the concentration of Ca(HCO₃)₂ is not raised to a power because its coefficient is 1.