1. Theoretical Yield & Percent Yield

2. Theoretical Yield & Percent Yield
Amount predicted by stoichiometry
(maximum possible amt of product)
Percent Yield
Actual Yield
X 100 = % Yield

3. EXAMPLE- Ethanol reacts with Acetic acid to produce Ethyl Acetate
EXAMPLE- Ethanol reacts with Acetic acid to produce Ethyl Acetate. Stoichiometry predicts that mol of the acetic acid reacting with excess ethanol will produce mol of ethyl acetate. It is found, however, that only mol of the acetate is obtained. What is the % yield? Rxn: E A  EA
Ans: % Yield

4. Practice
When g of Mg ribbon is burned a white ash, solid magnesium oxide is formed.
What is the theoretical yield for this reaction?
2 Mg + O2  2 MgO
12.15 g ?
12.15 g MgX (1 mol Mg/24.30 g Mg) X (2 mol MgO/2 mol Mg) X (40.30 g MgO/1 mol MgO) = g MgO
Theoretical Yield is g MgO

5. Percent Yield
When g of Mg ribbon is burned a white ash, solid magnesium oxide is formed.
Theoretical Yield is g MgO
What is the % Yield if g of ash is produced?
Ans: (16.12 g/20.15 g) x 100 = %
Meaning: you actually obtained 80.00% of what was theoretically expected.

6. Theoretical Yield
When KI is added to a solution containing g of lead II nitrate, solid lead II iodide (a yellow precipitate) is formed, PbI2. If g of the precipitate is produced calculate the % yield.

7. % Yield
When KI is added to a solution containing g of lead II nitrate, solid lead II iodide (a yellow precipitate) is formed, PbI2. If g of the precipitate is produced calculate the % yield.
Ans: % yield