Chemistry - Stoichiometry - Percent yield calculations - Percent Yield Calculation

Worked examples. Problem 1: 'A student reacts 24g of Mg with excess O₂. 2Mg + O₂ → 2MgO. She collects 32g of MgO. What is her percent yield?' Step 1: Calculate theoretical yield. 24g Mg ÷ 24 = 1 mol Mg. 1 mol Mg → 1 mol MgO (from ratio). 1 mol MgO × 40 g/mol = 40g (theoretical). Step 2: Apply formul