Objectives To understand the concept of limiting reactants

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Presentation transcript:

Objectives To understand the concept of limiting reactants To learn to recognize the limiting reactant in a reaction To learn to use the limiting reactant to do stoichiometric calculations To learn to calculate percent yield

A. The Concept of Limiting Reactants Stoichiometric mixture N2(g) + 3H2(g)  2NH3(g)

A. The Concept of Limiting Reactants Limiting reactant mixture N2(g) + 3H2(g)  2NH3(g)

A. The Concept of Limiting Reactants Limiting reactant mixture N2(g) + 3H2(g)  2NH3(g) Limiting reactant is the reactant that runs out first. H2

B. Calculations Involving a Limiting Reactant

B. Calculations Involving a Limiting Reactant

C. Percent Yield Theoretical Yield The maximum amount of a given product that can be formed when the limiting reactant is completely consumed. The actual yield (amount produced) of a reaction is usually less than the maximum expected (theoretical yield). Percent Yield The actual amount of a given product as the percentage of the theoretical yield.