RB # _____ Name _____________________________
Row/Seat ________ Date _____________________ Per. _____
Stoichiometry Problems
molar mass #1 molar ratio molar mass #2
grams #1 moles #1 moles #2 grams #2
coefficients
Directions: In solving each of the following problems, use the unit cancellation (factor-label) method.
Remember to always write your units and the formula after every number !!!
1. If 1.20 x 102 grams of sodium carbonate reacts with calcium hydroxide, how many grams of
sodium hydroxide are formed?
Na2CO3 + Ca(OH)2 2 NaOH + CaCO3
2. If 80.0 grams of calcium chloride reacts with silver nitrate, how many grams of silver chloride
are formed?
CaCl2 + 2 AgNO3 Ca(NO3)2 + 2 AgCl
3. If 90.0 grams of barium chloride reacts with sulfuric acid, how many grams of barium sulfate
are produced?
BaCl2 + H2SO4 BaSO4 + 2 HCl
4. If 5.00 x 102 grams of potassium iodide reacts with lead acetate, what mass of lead iodide is
formed?
Pb(C2H3O2)2 + 2 KI PbI2 + 2 KC2H3O2
5. How many grams of oxygen are produced by heating 4.00 x 102 grams of potassium chlorate?
2 KClO3 2 KCl + 3 O2
6. How many grams of sodium hydroxide will react with 1.50 x 102 grams of phosphoric acid?
H3PO4 + 3 NaOH 3 HOH + Na3PO4
7. If 6.00 x 102 grams of calcium hydroxide are neutralized with nitric acid, how many grams of
nitric acid are needed?
Ca(OH)2 + 2 HNO3 Ca(NO3)2 + 2 HOH
8. How many grams of calcium carbonate are required in the preparation of 50.0 grams of calcium
oxide?
CaCO3 CaO + CO2
9. How many grams of potassium chlorate are needed in the preparation of 70.0 grams of oxygen?
2 KClO3 2 KCl + 3 O2
10. When 50.0 grams of magnesium react with silver nnitrate in solution, how many grams of
silver are prepared?
Mg + 2 AgNO3 Mg(NO3)2 + 2 Ag
Chemistry-1 Stoichiometry Problems Page 2
RB # _____ Name _____________________________
Row/Seat ________ Date _____________________ Per. _____
Stoichiometry Problems
molar mass #1 molar ratio molar mass #2
grams #1 moles #1 moles #2 grams #2
coefficients
Directions: In solving each of the following problems, use the unit cancellation (factor-label) method.
Remember to always write your units and the formula after every number !!!
1. If 1.20 x 102 grams of sodium carbonate reacts with calcium hydroxide, how many grams of
sodium hydroxide are formed?
Na2CO3 + Ca(OH)2 2 NaOH + CaCO3
120 g Na2CO3 1 mol Na2CO3 2 mol NaOH 40.00 g NaOH
= 90.6 g NaOH
105.99 g Na2CO3 1 mol Na2CO3 1 mol NaOH
2. If 80.0 grams of calcium chloride reacts with silver nitrate, how many grams of silver chloride
are formed?
CaCl2 + 2 AgNO3 Ca(NO3)2 + 2 AgCl
80.0 g CaCl2 1 mol CaCl2 2 mol AgCl 143.32 g AgCl
= 207 g AgCl
110.91 g CaCl2 1 mol CaCl2 1 mol AgCl
3. If 90.0 grams of barium chloride reacts with sulfuric acid, how many grams of barium sulfate
are produced?
BaCl2 + H2SO4 BaSO4 + 2 HCl
90.0 g BaCl2 1 mol BaCl2 1 mol BaSO4 233.40 g BaSO4
= 101 g BaSO4
208.23 g BaCl2 1 mol BaCl2 1 mol BaSO4
4. If 5.00 x 102 grams of potassium iodide reacts with lead acetate, what mass of lead iodide is
formed?
Pb(C2H3O2)2 + 2 KI PbI2 + 2 KC2H3O2
500 g KI 1 mol KI 1 mol PbI2 461.00 g PbI2
= 694 g PbI2
166.00 g KI 2 mol KI 1 mol PbI2
Chemistry-1 Practicing the Mole - - Odd Problem Answer Key Page 3
5. How many grams of oxygen are produced by heating 4.00 x 102 grams of potassium chlorate?
2 KClO3 2 KCl + 3 O2
400 g KClO3 1 mol KClO3 3 mol O2 32.00 g O2
= 157 g O2
122.55 g KClO3 2 mol KClO3 1 mol O2
6. How many grams of sodium hydroxide will react with 1.50 x 102 grams of phosphoric acid?
H3PO4 + 3 NaOH 3 HOH + Na3PO4
150 g H3PO4 1 mol H3PO4 3 mol NaOH 40.00 g NaOH
= 184 g NaOH
98.00 g H3PO4 1 mol H3PO4 1 mol NaOH
7. If 6.00 x 102 grams of calcium hydroxide are neutralized with nitric acid, how many grams of
nitric acid are needed?
Ca(OH)2 + 2 HNO3 Ca(NO3)2 + 2 HOH
600 g Ca(OH)2 1 mol Ca(OH)2 2 mol HNO3 63.02 g HNO3
= 1,020 g HNO3
74.10 g Ca(OH)2 1 mol Ca(OH)2 1 mol HNO3
8. How many grams of calcium carbonate are required in the preparation of 50.0 grams of calcium
oxide?
CaCO3 CaO + CO2
50.0 g CaO 1 mol CaO 1 mol CaCO3 100.09 g CaCO3
= 89.2 g CaCO3
56.08 g CaO 1 mol CaO 1 mol CaCO3
9. How many grams of potassium chlorate are needed in the preparation of 70.0 grams of oxygen?
2 KClO3 2 KCl + 3 O2
70.0 g O2 1 mol O2 2 mol KClO3 122.55 g KClO3
= 179 g KClO3
32.00 g O2 3 mol O2 1 mol KClO3
10. When 50.0 grams of magnesium react with silver nitrate in solution, how many grams of silver
are prepared?
Mg + 2 AgNO3 Mg(NO3)2 + 2 Ag
50.0 g Mg 1 mol Mg 2 mol Ag 107.87 g Ag
= 444 g Ag
24.31 g Mg 1 mol Mg 1 mol Ag
Chemistry-1 Practicing the Mole - - Odd Problem Answer Key Page 4
