# Double Cheeseburgers and Stoichiometry - PowerPoint PPT Presentation

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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

### 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?