Double cheeseburgers and stoichiometry
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Double Cheeseburgers and Stoichiometry. 1 Double Cheeseburger needs 1 bun, 2 patties, 2 slices of cheese, 4 strips of bacon For 5 Double Cheeseburgers how many units of each ingredient do I need? Fill in the final column below with how many complete burgers I can make:. Objectives.

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Double Cheeseburgers and Stoichiometry

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Double Cheeseburgers and Stoichiometry

  • 1 Double Cheeseburger needs 1 bun, 2 patties, 2 slices of cheese, 4 strips of bacon

  • For 5 Double Cheeseburgers how many units of each ingredient do I need?

  • Fill in the final column below with how many complete burgers I can make:


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

  • For a Limiting reactant mixture the number of moles are not balanced to match the reaction equation

    • N2(g) + 3H2(g) 2NH3(g)

  • Limiting reactant is the reactant that runs out first

  • When the limiting reactant is exhausted, then the reaction stops


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.


According to his pre-lab theoretical yield calculations a student’s experiment should have produced 1.44g of magnesium oxide. When he weighed his product after reaction, only 1.23g of magnesium oxide was present. What is the student’s percent yield?


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