because 100 percent is the total or the whole and we cant exceed that because in other words it is everything
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Because the yield can never exceed the quantity in the original mix. ie if an ore sample contains 3% of a mineral, if that 3% is extracted totally, then the yield is 100% and cannot be more because that's all there is in the sample.
Percentage yield = (Actual yield / Theoretical yield) x 100% The percentage yield for a reaction is a value between 0 to 100 percent.
If this is the actual yield, real amount produced, then you need the theoretical yield to find the percent yield. % yield = (actual yield / theoretical yield) x 100
You did something wrong in your calculation or you have some impurity. You never get 100% yield.
Impurities in the substance can cause a greater percent yield. I recommend redoing the lab for better results.