Define limiting reactant and excess reactant. What is the...

Name: Problem 88, Chapter 3: Chemistry
Uploaded: 2020-07-08T21:27:56-08:00
Duration: 2 min 12 s
Channel: Daniel Kim
Description: Define limiting reactant and excess reactant. What is the significance of the limiting reactant in predicting the amount of the product obtained in a reaction? Can there be a limiting reactant if only one reactant is present?

Define limiting reactant and excess reactant. What is the significance of the limiting reactant in predicting the amount of the product obtained in a reaction? Can there be a limiting reactant if only one reactant is present?

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Key Concepts

Limiting Reactant

The limiting reactant is the substance in a chemical reaction that is completely consumed first, thereby determining the maximum amount of product that can be formed. It limits the extent of the reaction because once it is used up, no further reaction can occur, regardless of the amounts of other reactants present.

Excess Reactant

An excess reactant is one that is not completely consumed when the reaction is complete. This reactant is present in a greater amount than is necessary to react with the limiting reactant, and any remainder does not affect the maximum yield of the product.

Stoichiometry and Yield Prediction

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. The limiting reactant plays a crucial role in stoichiometry as it determines the theoretical yield of the reaction. Calculating the amounts of products formed requires understanding the proportions in which reactants combine, and the limiting reactant provides the boundary condition for these calculations. Furthermore, if only one reactant is present, it is inherently the limiting reactant provided the reaction can occur, as there are no other reactants to potentially impose a secondary limitation.

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