The amount of reactant in excess in grams should be determined after the completion of the reaction.
The study in which the amount of materials i.e. reactant or products are consumed or produced is known stoichiometry.
The reactant that runs out first and thus limits the amount of products which can form is known as limiting reactant or limiting reagent.
The balanced chemical equation is defined as the equation in which number of different atoms of elements on reactant side is similar to that of product side.
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