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What does percent yield mean in chemistry?
is the ratio of the actual yield to the theoretical yield. (If it is over 100% it means something went wrong.)
##"Percent yield" = "actual yield" /"theoretical yield"##
The actual yield is a product that is obtained by experimentation. The theoretical yield is obtained through stoichiometric calculation.
If the two yields are equal, you have 100 % yield.
Usually you obtain less than 100 %.
It is impossible to obtain a yield greater than 100%. If that happens, some experimental error must have occurred in the creation of the desired product, actual yield.