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Theoretical and Percentage Yield

Posted: Wed Oct 04, 2017 12:12 pm
by Tiffany Cao 1D
What is the difference between theoretical and percentage yield, if there is a difference? Also, what causes the theoretical yield to be less than the actual yield?

Re: Theoretical and Percentage Yield

Posted: Wed Oct 04, 2017 1:42 pm
by Chem_Mod
The difference is a difference between theoretical and actual (or experimental). Percentage Yield is calculated by the following:

So in an ideal world, theoretical yield would be the result that you end up with; however, there are several factors that could decrease your yield such as not transferring all of your material, not achieving perfect separation or the mechanism of the reaction being faulty. These will serve to decrease your actual yield, and will be reflected in your percentage yield.

Re: Theoretical and Percentage Yield

Posted: Wed Oct 04, 2017 2:33 pm
by Marcela Luna IJ
Chem_Mod wrote:The difference is a difference between theoretical and actual (or experimental). Percentage Yield is calculated by the following:

So in an ideal world, theoretical yield would be the result that you end up with; however, there are several factors that could decrease your yield such as not transferring all of your material, not achieving perfect separation or the mechanism of the reaction being faulty. These will serve to decrease your actual yield, and will be reflected in your percentage yield.


This is actually one of the best explanations that I have read and has actually made sense! Thank you!

Re: Theoretical and Percentage Yield

Posted: Wed Oct 04, 2017 2:34 pm
by Rita Dang 3D
Side reactions and impurities can also cause differences between actual and theoretical yield.

Re: Theoretical and Percentage Yield

Posted: Wed Oct 04, 2017 3:09 pm
by Jingyi Li 2C
Theoretical yield is the maximum amount of a product you can get from a reaction. It is calculated from the mole ratio of a balanced equation. Percentage yield, on the other hand, is obtained from the following formula: (actual yield/theoretical yield)*100%. Some factors that may causes the differences between actual and theoretical yield are side reactions, incomplete reactions, and impurities.