1. Theoretical Yield
The maximum amount of product that can be produced from a given amount of reactant.

2. Actual Yield
The measured amount of a product obtained from a reaction. In most chemical reactions, the amount of product is less than the theoretical amount that you could get.

3. Percent Yield
The ratio of the actual yield to the theoretical yield, multiplied by 100.
actual
% yield = theoretical x 100

4. C6H6 (l) + Cl2 (g) → C6H5Cl (s) + HCl (g)
Sample Problem 9-8
Chlorobenzene is prepared by the following process:
C6H6 (l) + Cl2 (g) → C6H5Cl (s) + HCl (g)
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 chlorobenzene?

5. Practice Problem #1
Methanol can be produced through the reaction of carbon monoxide and hydrogen in the presence of a catalyst. Pt
CO (g) H2 (g) → CH3OH (l)
If 75.0 g of CO reacts to produce 68.4 g of CH3OH, what is the percent yield of CH3OH?

6. Al (s) + CuSO4 (aq) → Al2(SO4)3 (aq) + Cu (s)
Practice Problem #2
Aluminum reacts with excess copper sulfate in the following unbalanced equation:
Al (s) + CuSO4 (aq) → Al2(SO4)3 (aq) + Cu (s)
If 1.85 g of Al react and the percent yield of Cu is 56.6 %, what mass of Cu is produced?