Percent Yield A batting average is a measure of how often a batter gets a hit as a percentage of how many times he tries. In chemistry, the percent yield.

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Presentation transcript:

Percent Yield A batting average is a measure of how often a batter gets a hit as a percentage of how many times he tries. In chemistry, the percent yield of a reaction is the amount of product made as a percentage of how much was attempted to be made. Print 1-3,5-7

12.3 percent yield: the efficiency of a reaction, or amount of product recovered as a percent of product intended. A batting average is actually a percent yield. A batting average is actually a percent yield.

the amount of product actually formed in the laboratory. 12.3 theoretical yield: the maximum amount of product that could be formed from given amounts of reactants. (calculated yield) actual yield: the amount of product actually formed in the laboratory.

12.9

13.9 g CaO 12.9 1 mol CaCO3 100.09 g CaCO3 1 mol CaO 1 mol CaCO3 24.8 g CaCO3 x x x = 13.9 g CaO

13.1 g CaO 13.9 g CaO x 100% = 94.2 % theoretical yield 13.9 g CaO 12.10 1 mol CaCO3 100.09 g CaCO3 1 mol CaO 1 mol CaCO3 56.08 g CaO 1 mol CaO 24.8 g CaCO3 x x x theoretical yield = 13.9 g CaO 13.1 g CaO 13.9 g CaO x 100% = 94.2 %

WHY? % yield is usually LESS than 100% 12.10 13.1 g CaO 13.9 g CaO x 100% = 94.2 % % yield is usually LESS than 100% WHY? Could it ever be MORE than 100%?

1. The theoretical yield is also called the percent yield actual yield Quick Quiz! 1. The theoretical yield is also called the percent yield actual yield calculated yield experimental yield

Quick Quiz. 2. Octane is burned in following equation: 2 C8H18 + 25 O2  16 CO2 + 18 H2O What is the percent yield if 14.6 g of CO2 are recovered when 5.00 g of C8H18 are combusted? 106% 94.8% 34.2% 62.5%