a percent yield will be above 100 if the product used are wet or more likely impure.
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Do you need it? Are you being told to calculate it? percent yield = (actual yield) divided by (theoretical yield) x 100
In manufacturing, no. A yield greater than 100% would mean that you put a certain amount of materials into the front end of the assembly line, and you got more operational, salable units off the back end than the materials were intended to comprise. In banking and investing, you have to hope the yield is more than 100% ... that your investment is worth more at the end of the year than it was when you invested it.
error in calculation or your final product is impure and has residuals of chemicals that were supposed to dissappear
Percent means out of 100 → 3 percent of 100 g = 3/100 × 100 g = 3 g
20/100 x 100 = 20 percent