Final answer:
The percent yield is a comparison between the actual yield and the theoretical yield. Proper percent yields are between 0% and 100%. A percent yield of 80%-90% is considered good to excellent.
Step-by-step explanation:
The percent yield is a comparison between the actual yield and the theoretical yield and is defined as:
percent yield: actual yield x 100% / theoretical yield
Proper percent yields are between 0% and 100%. A percent yield of 80%-90% is usually considered good to excellent; a yield of 50% is only fair.