The identification of the correct product when is the limiting reactant has to be explained.
Generally for chemists their goal is to produce the maximum quantity of the desired product from the starting materials. An excess of one reactant is frequently used to ensure that the more costly or more important reactant converted fully into the desired product. These more costly reactants limits the desired product amount so these reactants are called as limiting reactants. Which are present in excess amounts compare to limiting reactants are called as excess reactants.