GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Chemical Reactions & Quantities

Limiting Reagent

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The Limiting Reagent represents the compound that is totally consumed in the reaction. 

Limiting Reagent & Theoretical Yield

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concept

Limiting Reagent

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Theoretical Yield is the maximum amount of product a certain chemical reaction can form. It is determined by the limiting reagent.

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Limiting Reagent

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example

Limiting Reagent Example 1

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Problem

Acrylonitrile (C­3H3N) is the starting material for many synthetic carpets and fabrics. It is produced by the following reaction: 

2 C3H6 (g) + 2 NH3 (g) + 3 O2 (g)  → 2 C3H3N (g) + 6 H2O (g)

If 12.0 g C3H6, 10.0 g NH­3, and 5.0 g O2 react, what mass of acrylonitrile can be produced, assuming 100% yield?

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Problem

The reaction between solid aluminum and iron (III) chloride can generate temperatures reaching 3000 ºC and is used in welding metals. 

2 Al + Fe2O3 → Al2O­3 + 2 Fe

If 150 g of Al are reacted with 432 g of Fe­2O3, what is the mass of the excess reactant remaining?