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Percentage yield
Compares actual yield to theoretical yield
Actual yield
Mass of product obtained from the experiment
Theoretical yield
Maximum possible mass from calculation
Percentage yield formula
(actual yield ÷ theoretical yield) × 100
Why yield is never 100%
Losses during transfer, incomplete reactions, side reactions
Incomplete reaction
Not all reactants convert to products
Side reactions
Other reactions reduce amount of desired product
Product loss
Sticking to apparatus or evaporating
High percentage yield
Reaction is efficient
Low percentage yield
Reaction is inefficient or product lost
Example: actual 8 g, theoretical 10 g
(8 ÷ 10) × 100 = 80%
Yield has no units
It is a percentage
Improving yield
Reduce product loss, prevent evaporation, ensure complete reaction