In a reaction
A + B2 → AB2
Identify the limiting reagent, if any, in the following reaction mixture.
300 atoms of A + 200 molecules of B
A limiting reagent determines the extent of a reaction. It is the reactant which is the first to get consumed during a reaction, thereby causing the reaction to stop and limiting the amount of products formed.
According to the given reaction, 1 atom of A reacts with 1 molecule of B. Thus, 200 molecules of B will react with 200 atoms of A, thereby leaving 100 atoms of A unused. Hence, B is the limiting reagent.
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- Stoichiometry and Stoichiometric Calculations - Limiting Reagent