Yield (chemistry)

Yield in chemistry, also known as chemical yield and reaction yield, is the amount of product obtained in a chemical reaction. The absolute yield can be given as the weight in gram or in mol (molar yield). The yield is usually also given as a relative yield, which is the actual yield divided by the theoretical yield (the maximally reachable yield). The relative yield is usually given as a percentage value, the percent yield:

Related Topics:
Chemistry - Product - Chemical reaction - Weight - Gram - Mol - Percent

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:rac{actual yield}{theoretical yield} imes 100% = percent yield

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The theoretical yield value always relates to one of the reactants. This is usually the limiting one, taking into account the molar relation of the reactants and the stoichiometry of the reaction.

Related Topics:
Reactant - Stoichiometry

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The maximal yield of a chemical reaction would be 100%, a value that is never reached. Yields above about 90% are called very good, yields above about 75% are called good, yields below about 60% are called modest, yields below about 30% are called poor.

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