Limiting And Excess Reactants Worksheet. Say you take a reactant a and calculate the amount of moles of another reactant b required to use up all of a. Convert the masses in grams of the reactants involved into amounts in moles.
Sometimes quantities of both reactants are given. The reactant that produces fewer moles of product is the limiting reagent because it limits the amount of product that can be produced. Molar mass is represented by the symbol m.