To get the amount of excess reagent left over you must take the moles excess reactant you started with and subtract moles of excess reagent you used .

Question

BlackTom AI · Accepted Answer

In stoichiometry problems involving excess reagent, the goal is to determine how much of the excess reagent remains after the reaction.
Option 1: 'moles excess reactant you started with' corresponds to the initial amount of the excess reagent before the reaction occurs. This is the starting quantity from which we will subtract the amount that actually reacted.
Option 2: 'moles of excess reagent you used' represents the portion of the excess reagent that has been consumed during the reaction (i.e., the amount that has reacted). Subtracting this from the initial amount gives the leftover amount of the excess reagent.
Together, these two quantities are the key components of the calculation: initial moles of the excess reagent minus moles of the excess reagent that reacted equals moles of excess reagent remaining. If either piece is misidentified— for example, subtracting the wrong term or using the amount of reagent that did not react— the result would be incorrect.
Note that in some scenarios, the 'moles of excess reagent used' could be phrased as 'moles of excess reagent that reacted' or 'moles consumed' to emphasize that only the portion that participated in the reaction is subtracted from the initial amount.
No other quantities are required for this particular calculation, since the leftover amount is defined by the difference between what you started with and what was consumed.

1A W25 VidQuiz: Limiting Reagents

To get the amount of excess reagent left over you must take the moles excess reactant you started with and subtract moles of excess reagent you used .

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