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This is the theoretical yield, expressed in moles This can also be expressed in units of mass using the literature MW of the product use the mass of product obtained to determine the percent yield percent yield = grams of product obtained X 100% theoretical yield (in grams)From a reaction can be compared to the theoretical yield to give the percentage yield Percentage yield = Actual amount obtained ÷ Theoretical amount possible x 100% In this reaction, suppose the actual yield is 0905 g of ethyl bromideThe theoretical yield refers to the amount that should be form when the limiting reagent is completely consumed The actual yield is expressed as a percentage of the theoretical yield This is called the percent yield To find the actual yield, simply multiply the percentage and theoretical yield together Reaction Percent Yield Introduction And Practice Exercises How to calculate the theoretical yield in chemistry