The calculation of the yield is referred to the measure of moles of product formed in a reaction, in relation to the amount of reactant that has been consumed. When the subject is the maximum amount of product that could be produced with a given reactant, it is defined as theoretical yield, while the amount that is actually obtained is the actual yield. The calculation of the theoretical yield starts by dividing the mass of reactant to its molecular weight, therefore obtaining the moles. Based on the principle that in a reaction the moles of reagent equal the moles of product, if these are multiplied by the molecular weight of the product, the ideal mass is obtained. When the actual yield is divided by the theoretical yield times a hundred, you obtain the percentage yield.