Limiting Reactants
The limiting reactant determines how much product can be made. At the end of a reaction there is NO more limiting reactant left.
The excess reactant is leftover at the end of the reaction.
Example: If I am making smores and I have 20 marshmallows and 15 pieces of chocolate. The chocolate is the limiting reactant because it limits how many smores we can make. Once I am done making smores I will have 0 pieces of chocolate left. The marshmallows are the excess reactants. After making smores I will have 5 marshmallows left over.
The excess reactant is leftover at the end of the reaction.
Example: If I am making smores and I have 20 marshmallows and 15 pieces of chocolate. The chocolate is the limiting reactant because it limits how many smores we can make. Once I am done making smores I will have 0 pieces of chocolate left. The marshmallows are the excess reactants. After making smores I will have 5 marshmallows left over.