The reactant which is totally consumed during the course of reaction and when it is consumed reaction stops.
The concept of limiting reactant is applicable to reaction other than monomolecular i.e., when more than one type reactant involved. For example. These is no limiting reactant.
To determine the limiting reagent amount of all reactants and mole ratio of reactants must be known. If the ratio of moles of reactant A with respect to reactant B is greater than the ratio of the moles of A to moles of B for a balanced chemical equation then B is the limiting reactant.
All other terms like left (unused) mass of other reactant, amount of formed product can be known stoichiometrically by knowing the amount of limiting reactant
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