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Question
In a reaction, \[\ce{A + B2 -> AB2}\]
Identify the limiting reagent, if any, in the following reaction mixture.
5 mol A + 2.5 mol B
Solution
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.
1 mol of atom A combines with 1 mol of molecule B. Thus, 2.5 mol of B will combine with only 2.5 mol of A. As a result, 2.5 mol of A will be left as such. Hence, B is the limiting reagent.
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