Yield is also referred to as chemical yield and reaction yield and is the amount of product obtained in a reaction. The absolute yield can be given as the weight in grams or in molar (molar yield) while the fractional yield or relative yield or percentage yield is calculated by dividing the amount of the obtained product in moles by the theoretical yield in moles:
The percentage yield is obtained by multiplying the fractional yield by 100%.
One or more reactants in a chemical reaction are often used in excess and thus the theoretical yield is therefore calculated based on the molar amount of the limiting reactants, keeping in mind the stoichiometry of the reaction. Also it is assumed that, for the calculation, there is only one reaction involved.
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