You may have used too much of the reactants. You may have recorded the mass of the reactants or products incorrectly.
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if you received 85.0 percent back from your product then your percent yield is 85 percent.
why don't reactions give us a 100 percent yield?
The yield would be 15.38%.
that means that 69.8 grams will be produced when the theoretical yield is 100 grams.
The reaction may have not been complete yet, therefore resulting in a higher percent yield than 100%