Find the reactant (Limiting Reagent) by using the mass of a substance in the reaction of the proposition number assigned. In this Proposition given 8.5 grams of precursors used as a divisor, so in the case of 34 gases, ammonia and 98 is a Division in the case of amino acids sulphuric, so it will be that the 8.5/34 equal to 0.25 and 8.5/98 equivalent to 0.086.