4.3.3.1 - Percentage yield
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4 Terms
What is the amount of product obtained known as?
The amount of a product obtained is known as the yield.
What is percentage yield?
It is the yield (amount of desired product obtained) when compared with the maximum theoretical amount as a percentage
Give the formula for percentage yield.
(mass of product actually made / maximum theoretical mass of product ) x100
Give the reasons why it is no always possible to obtain the calculate amount of product (even if mass is conserved)
the reaction may not go to completion because it is reversible
some of the product may be lost when it is separated from the reaction mixture. (Also lose material when it is transferred from one container to another)
some of the reactants may react in ways different to the expected reaction (side reactions e.g. with gases in the air or impurities in the reaction mixture that end up forming extra products)