Difference between revisions of "Percentage Yield"

Revision as of 02:13, 27 November 2019

The percentage yield is the mass of a product in an chemical reaction compared to the mass that could theoretically be produced in a perfect reaction as a percentage.

The percentage yield is useful to work out the efficiency of a chemical reaction and considering the cost of forming the desired product.

Percentage Yield = (Actual mass of product / Theoretical maximum mass of product)x100%

Percentage Yield = \(\frac{M_A}{M_T}\times 100%\)

Where:

M_A = Actual mass of product

M_T = Theoretical maximum mass of product

Reversible Reactions - Some reactions are reversible which means the products may react to form the original reactants resulting in less than 100% of the theoretical maximum mass of product.
Purity of Reactants - If the reactants are not pure then there is not as much of the original chemicals as was believed, resulting in less product being formed.
Collection of Product - Collecting and separating out the products may not be an easy process and some of the product may be lost in the process.
Unwanted Reactions - Sometimes there may be other chemical reactions which take place in the reaction mixture, this may reduce the amount of desired product.

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+====Edexcel====
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+:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Percentage yields, page 66, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']
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