PERCENT YIELD

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

Formula

Percent yield = Actual Yield____ x 100% Theoretical YieldCalculations:Step 1: Find theoretical Yield by mass-mass

calculationsStep 2: Calculate percent yield

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

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?

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?