When 80 g CaCO₃ decomposes, the actual yield of CO₂ is 30 g. What is the percentage yield? CaCO₃ → CaO + CO₂

100 g CaCO₃ theoretically gives 44 g CO₂. 80 g CaCO₃ gives: Theoretical yield = (80/100) × 44 = 35.2 g. Percentage yield = (30/35.2) × 100 ≈ 85%.