Stoichiometry Example
I. Hamburger Analogy
Recipe for a bacon double cheeseburger is:




1 hamburger bun
2 hamburger patties
2 slices of cheese
4 strips of bacon
Based on this recipe;
1. If I have five bacon double cheeseburgers;
a) How many hamburger buns do I have?
b) How many hamburger patties do I have?
c) How many slices of cheese do I have?
d) How many strips of bacon do I have
2. How many bacon double cheeseburgers can you make if you start with;
a) 1 bun, 2 patties, 2 slices of cheese, 4 strips bacon
b) 2 buns, 4 patties, 4 slices of cheese, 8 strips of bacon
c) 1 dozen buns, 2 dozen patties, 2 dozen, slices of cheese, 4 dozen bacon
strips
d) 1 mole buns, 2 mole patties, 2 mole slices of cheese, 4 mole bacon strips
e) 10 buns, 20 patties, 2 slices of cheese, 40 strips of bacon
3. If you had fixings for 100 bacon double cheeseburgers, but when you were cooking
you ruined 10 of them; what percentage of the bacon double cheeseburgers did you
actually make?
II. Chemistry Problem
NOTE: The math and the concepts are identical to the above example. The only
difference is the recipe.
RECIPE
H2SO4 (aq) + 2 NaOH (aq) -> Na2SO4 (aq) + 2 H2O (l)
1. If I want to make 5 moles of Na2SO4 (aq);
a) How many moles of H2SO4 (aq) do I need?
b) How many moles of NaOH (aq) do I need?
2. How much Na2SO4 (aq) can I make if I have;
a) 1 mole of H2SO4 (aq) and 2 mole NaOH (aq)?
b) 10 moles of H2SO4 (aq) and 20 mole NaOH (aq)?
c) 0.1 mole of H2SO4 (aq) and 0.2 mole NaOH (aq)?
d) 1 mole of H2SO4 (aq) and 20 mole NaOH (aq)?
e) 0.42 mole of H2SO4 (aq) and 0.65 mole NaOH (aq)?
f) 5 grams of H2SO4 (aq) and 5 grams NaOH (aq)?
ANSWERS
I. Hamburger Analogy
1.
a)
b)
c)
d)
5
10
10
20
2.
a)
b)
c)
d)
e)
1
2
1 dozen
1 mole
1 hamburger
3. 90 %
II. Chemistry Problem
1
a) 5 moles
b) 10 moles
2.
a)
b)
c)
d)
e)
f)
1 mole
10 moles
0.1 mole
1 mole
0.325 moles
7.24 grams