Consider the following equilibrium (K_c = 2.68 × 10⁻³ at 800 °C):
CaCO₃ (s) ⇌ CaO (s) + CO₂ (g)
Is the formation of products favored at equilibrium? What is/are the relative concentration/s of the species involved at equilibrium?

• A. Yes, the formation of products is favored at equilibrium.
  [CO₂] = 2.68×10⁻³
• B. Yes, the formation of products is favored at equilibrium.
  [CaCO₃] = [CaO][CO₂]/2.68×10⁻³
  [CaO] = 2.68×10⁻³[CaCO₃]/[CO₂]
  [CO₂] = 2.68×10⁻³[CaCO₃]/[CaO]
• C. No, the formation of reactant is favored at equilibrium.
  [CO₂] = 2.68×10⁻³
• D. No, the formation of reactant is favored at equilibrium.
  [CaCO₃] = [CaO][CO₂]/2.68×10⁻³
  [CaO] = 2.68×10⁻³[CaCO₃]/[CO₂]
  [CO₂] = 2.68×10⁻³[CaCO₃]/[CaO]

Answer: (C)