Name: ________________________________________
Worksheet – Stoichiometry
Use the following equation to answer the questions on this worksheet.
8 CO + 17 H2 → C8H18 + 8 H2O
1. Write the two possible mole ratios between CO and H2.
8 moles CO
17 moles H2
17 moles H2
8 moles CO
2. In the mole ratio for a stoichiometry problem, the moles of the ___find________ goes on top, while the moles of the
_given_________________ goes on the bottom.
3. Write the mole ratio when you are trying to find the number of grams of H2 used when 15 moles of CO was used.
17 moles H2
8 moles CO
4. How many moles of CO are used when 400 grams of C8H18 is formed.
Given: 400 g C8H18
Find: ? moles CO
8 moles CO
1 mole C8H18
1 mole C8H18 = 114 g C8H18
400 g C8H18 x 1 mole C8H18 x 8 moles CO = 28 moles CO
114 g C8H18
1 mole C8H18
5. How many grams of H2 is used when 650 grams of H2O is formed.
Given: 650 g H2O
Find: ? g H2
17 moles H2
8 moles H2O
650 g H2O x 1 mole H2O x 17 moles H2 x 2 g H2
= 153 g H2
18 g H2O
8 moles H2O 1 mole H2
1 mole H2O = 18 g H2O
1 mole H2 = 2 g H2