Next determine the percentage yield. Calculate the theoretical yield of the process. You need to begin with a balanced chemical equation and define the limiting reactant.
Identify the Limiting Reagent.
Therefore the percent yield will never be 100 but it is still useful to know as a metric to base your efficiency of reaction off. Percentage yield mass of actual yield mass of theoretical yield 100 Lets assume that you obtained an actual yield of 850 grams. Identify the Limiting Reagent. Calculating Percent Yield 1.