Usually, the amount of product actually produced in a reaction is less than the theoretical yield. To find the efficiency of a reaction, you can get a percent yield by comparing actual yield and theoretical yield. Percent yield is the actual yield divided by the theoretical yield of a reaction multiplied by 100. Percent yield is pretty easy once you do some practice problems.
Helpful links
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/mass-relationships-and-chemical-equations-3/reaction-stoichiometry-44/calculating-theoretical-and-percent-yield-234-4704/
https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/limiting-reagent-stoichiometry/a/limiting-reagents-and-percent-yield
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