2. Essential Questions What is percent yield and how do you calculate it?
What are theoretical and actual yields?

3. Percent Yield (don’t need to write)
You prepared enough cookie dough to make 5 dozen cookies. You burn one batch which you throw out, but the rest of the cookies are okay.
How many cookies could you have made?
5 dozen
How many cookies do you still have?
4 dozen

4. Percent Yield (cont)
Scientists use percent yield to measure how efficient a reaction was
Percent yield: ratio of the actual yield to the theoretical yield, multiplied by 100.
The yield for the cookies would be 80%

5. Percent Yield (cont)
Actual yield: experimental amount of product formed
Theoretical yield: maximum amount of product that could be formed from given amounts of reactants

6. Percent Yield (cont)
When 36.8 g Al(OH)3 reacts with excess K2CO3, the actual yield of KOH is 58.8 g. What is the percentage yield of KOH?
3 K2CO3 + 2 Al(OH)3  6 KOH + Al2(CO3)3
A piece of Copper with a mass of 5.0 g is placed in a solution of silver nitrate. The silver metal produced has a mass of 15.2 g. What is the percent yield?
Cu + 2 AgNO3 → 2 Ag + Cu(NO3)2
74.1%

7. Limiting Reactant and Percent Yield Practice Problem
C6H6 is reacted Br2 to produce C6H5Br and HBr as shown below. When .512 mol of C6H6 are reacted with excess Br2, 65.0 g of C6H5Br is produced.
C6H6 + Br2 → C6H5Br + HBr
a. What is the theoretical yield of C6H5Br?
b. What is the percent yield?
80.4 g
80.8%

8. Limiting Reactant and Percent Yield Practice Problem
Answer the following questions for the combustion of 5.00 g octane (C8H18) in excess O2.
2 C8H O2 → 16 CO H2O
What is the theoretical yield of CO2?
What is the percent yield if 14.6 g of CO2 are produced?

9. Essential Questions What is percent yield and how do you calculate it?
What are theoretical and actual yields?

10. 7.2 Tracked Assignment
worksheet