Basic Stoichiometry
Using your “Stoichi” or map, complete the
following stoichiometry calculations. No
CALCULATOR can be used.
Balance the equation first:
__H2(g) + __O2(g) --> __H2O(l)
13.3- Moleknown --> Moleunknown
1. If you have 8 moles of hydrogen, how many moles of oxygen are
needed?
2. 12 moles of water are produced,
a. How many moles of oxygen are needed to react?
b. How many moles of hydrogen are needed to react?
13.5- Moleknown --> Massunknown
3. If 7 moles of water are produced, how many grams of oxygen are
needed for the reaction?
4. You have 10 moles of hydrogen, how many grams of water are
produced?
5. How many grams of water produced from 6 moles of oxygen gas?
13.5- Massknown --> Moleunknown
6. How many moles of oxygen will react with 6 grams of hydrogen?
7. 32 grams of oxygen react with hydrogen, how many moles of water will
be produced?
8. How many moles of hydrogen reacted with oxygen if 90.0 grams of
water are produced?
13.4- Massknown --> Massunknown
9. How many grams of water will be produced from 10 grams of
hydrogen?
10. With 96 grams of oxygen reacting with hydrogen how much water will
be produced from the reaction?
13.911. Copper reacts with sulfur to form copper(I) sulfide according to the
following balanced equation:
2Cu(s) + S(s) → Cu2S(s)
What is the limiting reagent when 80.0 g Cu reacts with 25.0 g S?
12. Rust forms when iron, oxygen, and water react. One chemical equation
for the formation of rust is
2Fe + O2 + 2H2O → 2Fe(OH)2
If 7.0 g of iron and 9.0 g of water are available to react, which is the limiting
reagent?
13.13
Q 13. Carbon tetrachloride, CCl4, is a solvent that was once used in large
amounts in dry cleaning. One reaction that produces carbon tetrachloride is
CS + 3Cl → CCl + S Cl
2
2
4
2
2
What is the percent yield of CCl4 if 617 kg is produced from the reaction of 312
kg of CS2?
Answers
1. 4 mol O2
2. 12 mol H2; 6 mol O2
3. 117g O2
4. 160g O2
5. 216g H2O
6. 1.5 mol O2
7. 2 mol H2O
8. 5 mol H2
9. 90g H2O
10. 108g H2O
11. Cu
12. Fe
13. Theoretical Yield = 632.21Kg
Percent yield = 97.5 %