Determining Limiting Reagent
This presentation will demonstrate a step-by-step process by which
one can determine the limiting reagent of a given reaction.
636/584-6688 General_tutoring@eastcentral.edu
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Determining Limiting Reagent, Schemes and Mind Maps of Stoichiometry
Determining Limiting Reagent. This presentation will demonstrate a step-by-step process by which one can determine the limiting reagent of a given reaction.
Typology: Schemes and Mind Maps
2021/2022
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Determining Limiting Reagent
This presentation will demonstrate a step-by-step process by which one can determine the limiting reagent of a given reaction. 636/584- 6688 General_tutoring@eastcentral.edu
Step 1: Begin with a balanced chemical
equation with given amounts of both
reactants.
A. One of given amounts will be the limiting
reagent; it will be completely used up in the
course of the reaction.
B. The other reactant will be the excess
reagent; there will be some of this reactant
left over when the reaction is complete.
Step 3: Calculate moles that are used of
one of the reactants.
(A) Choose one of the two moles calculated from Step 2.
(B) Convert that number of moles to moles of the other
substance by multiplying by a mole/mole ratio where the
coefficients from the balanced chemical equation are
used in the conversion factor.
(C) The number of moles you calculate are the number of
moles used of that substance. Label that substance
MOLES NEEDED.
Step 4: Compare “Moles Have” with “Moles
Used” to determine limiting/excess reagent.
(A) If the calculated MOLES NEEDED is greater than the MOLES HAVE for a given reactant, then that reactant is the limiting reagent. In a given stoichiometry problem, you will use this reactant to determine amount of product formed. (B) If the calculated MOLES NEEDED is less than the MOLES HAVE for a given reactant, then that reactant is the excess reagent.