5 14 2012
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5.14.2012. Chem IH Class Notes Limiting Reactant. Limiting Reactants. Stoichiometric Proportions: Limiting Reactant: Excess Reactant:. LR – How To. To find the Limiting reactant in a chemical reaction: Pick a reactant and assume it is the LR.

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5.14.2012

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5 14 2012

5.14.2012

Chem IH

Class Notes

Limiting Reactant


Limiting reactants

Limiting Reactants

  • Stoichiometric Proportions:

  • Limiting Reactant:

  • Excess Reactant:


Lr how to

LR – How To

To find the Limiting reactant in a chemical reaction:

  • Pick a reactant and assume it is the LR.

  • Calculate the amount of the other reactant needed to use up all of the LR.

  • Compare the amount needed to the amount available, for the second reactant. (given in the problem.)

    • If you have enough of it (more available than needed) then it is the XS reactant, and you guessed right: The first reactant is the LR

    • If you don’t have enough of it (more needed than you are given) then you guessed wrong: the second reactant is the LR and the first is in XS.


2 h 2 o 2 2 h 2 o

2 H2 + O2 2 H2O

  • Determine the LR of the reaction when given 1.22g O2 and 1.05g H2.


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