If a reaction goes to completion how much of the limiting reagent will there be left?

Question

BlackTom AI · Accepted Answer

First, consider what it means for a reaction to go to completion in a stoichiometric sense: the reaction proceeds until the limiting reagent is completely consumed.
Option 1: 'none' — This is consistent with the defining role of the limiting reagent: by the time the reaction has consumed all of the limiting reagent, there is no amount of it left to react further, so zero remains. The other reactant(s) may be left in excess, but the limiting reagent itself is exhausted.
Option 2: 'unknown' — This would be incorrect because, regardless of the initial amounts, the concept of a limiting reagent guarantees that, at completion, all of the limiting reagent has been consumed. The exact leftovers would pertain to the excess reagent, not the limiting one, and we are specifically being asked about the limiting reagent.
Additional nuance: If a reaction goes to completion, the stoichiometric relationship dictates consumption of reactants in fixed mole ratios. As long as the reaction reaches completion under the given conditions, there is no remaining amount of the limiting reagent; it has been fully converted into products. The presence of any leftovers would indicate that the reagent in question was not the limiting one, which contradicts the premise of completion under limiting conditions.
In summary, the concept hinges on the fact that the limiting reagent is completely consumed, leaving no amount of it behind, while the excess reagent may persist.

1A W25 VidQuiz: Limiting Reagents

If a reaction goes to completion how much of the limiting reagent will there be left?

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