Stoichiometry Problems
For each problem map the problem and then solve it. All equations are balanced.
1. For the equation below, if you have 3 moles of NH4NO3 how many moles of H2O can you produce?
NH4NO3 à N2O + 2 H2O
3 moles NH4NO3 x 2 mol H2O = 6 moles H2O
1 mole NH4NO3
2. For the equation below, if you have 6 moles of H2O how many moles of N2 will be produced?
N2H4 + 2 H2O à N2 + 2 H2O + 2 H2
6 moles H2O x 1 mole N2 = 3 moles N2
2 mole H2O
3.For the equation below, if you have 3 moles of N2H4 how many moles of H2O will be
produced?
N2H4 + 2 H2O à N2 + 2 H2O + 2 H2
3 moles N2H4 x 2 moles H2O = 6 moles H2O
1 mole N2H4
4. You have 10 moles of N2 how many moles of H2O did you start with?
N2H4 + 2 H2O à N2 + 2 H2O + 2 H2
10 moles N2 x 2 moles H2O = 20 moles H2O
1 mole N2
5. You have 10 moles of C2H5 how many moles of O2 will you need for the reaction?
2 C2H5 + 5 O2 à 4 CO2 + 2 H2O
10 mole C2H5 x 5 mole O2 = 25 moles O2 2 moles C2H5
6. You have 10 moles of O2 how many moles of H2O will be produced?
2 C2H5 + 5 O2 à 4 CO2 + 2 H2O
10 moles O2 x 2 moles H2O = 4 moles H2O
5 moles O2
7. You have 54 grams of C2H5 how many moles of H20 can you produce?
2 C2H5 + 5 O2 à 4 CO2 + 2 H2O
54 g
54g x 1 mole C2H5 = 1.86 C2H5 moles
29 g
1.86 C2H5 moles x 2 moles H2O = 1.9 H2O moles
2 moles C2H5
8. You have 132 grams of O2 how many moles of CO2 can you produce?
2 C2H5 + 5 O2 à 4 CO2 + 2 H2O
132g
132 g x 1 mole O2 = 4.125 O2 moles
32 g
4.125 O2 moles x 4 moles CO2 = 3.3 CO2 moles
5 moles O2
9. You have 92 grams of Na how many grams of NaOH can you produce?
2 Na + 2 H2O à 2 NaOH + H2
92 g
92 g x 1 mole Na = 4 moles Na
23 g
4 moles Na x 2 moles NaOH = 4 moles NaOH
2 moles Na
4 moles NaOH x 40.00g = 160 g NaOH
1 moles NaOH
10. You have 92 grams of Na how many grams of H2 can you produce?
2 Na + 2 H2O à 2 NaOH + H2
92 g
92 g x 1 mole Na = 4 moles Na
23 g
4 moles Na x 1 moles H2 = 2 moles H2
2 moles Na
2 moles Na x 2.02 g H2 = 4.0 moles H2
1 moles H2
11. You have 54 grams of H2O how many grams of Na will you need?
2 Na + 2 H2O à 2 NaOH + H2
54 g
54 g x 1 mole H2O = 3 moles H2O
18 g
3 moles H2O x 2 moles Na = 3 moles Na
2 moles H2O
3 moles Na x 22.99 g Na = 68.97 g Na = 69 g Na
1 moles Na