1. Percent Yield: amount of product recovered as a percent of product intended. 1)What percent is 8 of 20? 2)If a reaction made 50 g of product, but was supposed to produce 75 g, what was the percent produced? 8 20 x 100 =40% 50 75 x 100 =67%

2. theoretical yield: the maximum amount of product that could be formed from limiting reactant. (calculated yield) actual yield: the amount of product actually recovered in the laboratory.

3. What is the theoretical yield of CaO if 24.8 g CaCO 3 is decomposed? Calcium carbonate, found in seashells, decomposes by heating as shown in the reaction. 24.8 g CaCO 3 x 1 mol CaCO 3 100.09 g CaCO 3 13.9 g CaO = 1 mol CaO 1 mol CaCO 3 x x 56.08 g CaO 1 mol CaO

4. What is the percent yield if 13.1 g CaO is actually produced when 24.8 g CaCO 3 is decomposed? Calcium carbonate, found in seashells, decomposes by heating as shown in the reaction. 24.8 g CaCO 3 x 1 mol CaCO 3 100.09 g CaCO 3 13.9 g CaO = 1 mol CaO 1 mol CaCO 3 x x 56.08 g CaO 1 mol CaO theoretical yield 13.1 g CaO 13.9 g CaO x 100% = 94.2 %

5. % yield is usually LESS than 100% WHY? Could it ever be MORE than 100%? 13.1 g CaO 13.9 g CaO x 100% = 94.2 %

6. 1.The theoretical yield is also called the… A.percent yield B.actual yield C.calculated yield D.experimental yield Quick Quiz!

7. 2.What is the percent yield of CO 2 if 14.6 g of CO 2 are recovered when 5.00 g of C 8 H 18 are combusted? 2 C 8 H 18 + 25 O 2  16 CO 2 + 18 H 2 O A. 106% B. 94.8% C. 34.2% D. 62.5% Quick Quiz. C 8 H 18 114.26 g/mol CO 2 44.01 g/mol 5.00 g C 8 H 18 x 1 mol C 8 H 18 114.26 g C 8 H 18 theoretical yield = 15.4 g CO 2 = 16 mol CO 2 2 mol C 8 H 18 x x 44.01 g CO 2 1 mol CO 2 14.6 g CO 2 15.4 g CO 2 x 100% = ? actual yield act. theo. x 100