Yield the amount of product Theoretical yield the

Yield: the amount of product Theoretical yield: the amount of product we expect, based on stoichiometric calculations Actual yield: amount of product from a procedure or experiment (this is given in the question) Percent yield: actual yield x 100% theoretical yield

Sample problem Q - What is the % yield of H 2 O if 138 g H 2 O is produced from 16 g H 2 and excess O 2? Step 1: write the balanced chemical equation 2 H 2 + O 2 2 H 2 O Step 2: determine actual and theoretical yield. Actual is given, theoretical is calculated: 16 g H 2 1 mol H 22 mol H 2 O 18. 02 g = 143 H 2 O 2 mol 2. 02 g 1 mol g H 2 O Step 3: Calculate %H yield 2 % yield = actual x 100%=138 g H 2 O x 100%= 96. 7 theoretic 143 g % al HO

Practice problem Q - What is the % yield of NH 3 if 40. 5 g NH 3 is produced from 20. 0 mol H 2 and excess N 2? Step 1: write the balanced chemical equation N 2 + 3 H 2 2 NH 3 Step 2: determine actual and theoretical yield. Actual is given, theoretical is calculated: 20. 0 mol H 2 2 mol NH 3 3 mol H 2 17. 04 g = 227 g NH 3 1 mol NH 3 Step 3: Calculate % yield 3 100%= 17. 8 % yield = actual x 100%=40. 5 g NHx theoretic 227 g % al NH 3

Practice Problems 1. ) The electrolysis of water forms H 2 and O 2. 2 H 2 O 2 H 2 + O 2 What is the % yield of O 2 if 12. 3 g of O 2 is produced from the decomposition 14 g of H 2 O? Actual yield is 12. 3 g of O 2 2. ) 2 KCl. O 3 2 KCI + 3 O 2 107 g of oxygen is produced by heating 300 grams of potassium chlorate (KCl. O 3). Calculate % yield. Actual yield is 107 g of oxygen

Practice Problems continued • 3. ) Fe + S Fe. S – What is the % yield of ferrous sulfide (Fe. S) if 3. 00 moles of Fe reacts with excess sulfur to produce 220 grams of ferrous sulfide? – What is the actual yield given? Solve for % yield.