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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
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:
slide2

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
A. The Concept of Limiting Reactants
  • Stoichiometric mixture
    • N2(g) + 3H2(g) 2NH3(g)
a the concept of limiting reactants1
A. The Concept of Limiting Reactants
  • Limiting reactant mixture
  • N2(g) + 3H2(g) 2NH3(g)
a the concept of limiting reactants2
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
c percent yield
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.
slide9
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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