The limiting reactant in a chemical reaction is always the reactant which is present in the least amount in terms of mass.

Name: The limiting reactant in a chemical reaction is always the reactant which is present in the least amount in terms of mass.
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Quizplus · Accepted Answer

The limiting reactant is the one that will be completely used up first in a chemical reaction, limiting the amount of product formed, and it is determined by stoichiometry, not necessarily by which reactant has the least mass.

The Limiting Reactant in a Chemical Reaction Is Always the Reactant