1. PERCENT YIELD

2. VOCABULARY THERORETICAL YIELD:
MAXIMUM AMOUNT OF PRODUCT THAT CAN BE PRODUCED FROM A GIVEN AMOUNT OF REACTANT
ACTUAL YIELD:
MEASURED AMOUNT OF PRODUCT OBTAINED FROM A REACTION
In most chemical reactions the amount of product obtained is always less than the theoretical yield

3. Formula
Percent yield = Actual Yield____ x 100% Theoretical Yield Calculations: Step 1: Find theoretical Yield by mass-mass calculations Step 2: Calculate percent yield

4. Example 1
When 36.8 g of C6H6 react with an excess of Cl2 the actual yield of C6H5Cl is 38.8 g. What is the percent yield of C6H5Cl?
C6H6 + Cl2 → C6H5Cl

5. Example 2
Methanol can be produced through the reaction of CO and H2 in the presence of a catalyst: Co + 2H2 → CH3OH
If 75.0 g of CO reacts to produce 68.4 g of CH3OH what is the percent yield?

6. Example 3
Aluminum reacts with excess copper II sulfate according to the reaction given below.
al + Cu(SO4) → Al2(SO4)2 + Cu
If 1.85g of Al react and the percent yield of Cu is 56.6%, what mass of Cu is produced?