1. Theoretical Yield and Percent Yield Recipe says makes 3 dozen, you get 30. Your percent yield is 83.33%.

2. Theoretical Yield The predicted amount of product is the theoretical yield. It is the amount of product expected based on the amounts of reactants available.

3. Theoretical Yield What is the theoretical yield of s’mores?

4. Calculating Theoretical Yield Theoretical Yield is calculated by using molar ratios of reactants to products. The limiting reagent will determine the theoretical yield.

5. Learning Check 10.0g of Al reacts with 35.0 grams of Cl 2 to produce AlCl 3. Which reactant is limiting, which is in excess, and how much product is produced? 2 Al + 3 Cl 2  2 AlCl 3

6. Learning Check Start with Al: Now Cl 2 : = 43.88 mole AlCl 3 limiting reagent

7. Learning Check The predicted amount of product is the theoretical yield. 43.88 g of AlCl 3 is the calculated product, so that is the theoretical yield.

8. Percent Yield Percent yield is the percent of the theoretical yield that was made by our experiment. x (the amount you expect to get from the reaction)

9. Percent Yield The percent yield is always less than 100%. Why? Experimental error in measurements (masses), loss of product in handling, and imperfect ratios of reactants

10. Learning Check A student conducts a reaction that produces 2.755 grams of copper (Cu). If the theoretical yield of Cu is 3.150 grams (the amount of copper expected to be produced) what is the student's percent yield?

11. Percentage Yield percentage yield = x 100 percentage yield = 87.46 %