The equation for percent yield is percent yield actual yieldtheoretical yield x. An extra factor is added to the conversion of number of moles to allow for the fact that only 85 of the sulfur dioxide actually reacts. Optimum yield is the best possible yield achieved for a set of given reaction conditions.
If there was initially a certain amount of products in the mixture.
Hence the percent yield is given by. Optimum yield is the best possible yield achieved for a set of given reaction conditions. First enter the value of the Actual Yield. For a chemical reaction which goes to completion 1.