The percent yield is 45 %. CaCO₃ →CaO + CO₂ First, calculate the theoretical yield of CaO. Theor. yield = 60 g CaCO 3 × 1 mol CaCO 3 100.0 g CaCO 3 × 1 mol CaO 1 mol CaCO 3 × 56.08 g CaO 1 mol CaO = 33.6 g CaO Now calculate the percent yield. % yield = actual yield theoretical yield × 100 % = 15 g 33.6 g × 100 % = 45
