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Double Cheeseburgers and Stoichiometry

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- 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

- Stoichiometric mixture
- N2(g) + 3H2(g) 2NH3(g)

- Limiting reactant mixture

- N2(g) + 3H2(g) 2NH3(g)

- 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

- 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?