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Stoichiometry Practice Problems, Slides of Stoichiometry

Universiteit AntwerpenStoichiometry

Stoichiometry Practice Problems. **Balance the following equations FIRST, then answer the questions: Mole-to-Mole: 1. N2 + H2 → NH3.

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2021/2022

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CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!
CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!
Stoichiometry Practice Problems
**Balance the following equations FIRST, then answer the questions:
Mole-to-Mole:
1. N2 + H2 NH3
How many moles of hydrogen are needed to completely react with 2.0 moles of nitrogen?
2. C3H8 + O2 CO2 + H2
How many moles of oxygen are necessary to react completely with 4.0 moles of propane (C3H8)?
3. K3PO4 + Al(NO3) 3 KNO3 + Al PO4
How many moles of potassium nitrate are produced when 2.0 moles of potassium phosphate react
with aluminum nitrate?
Mole-to-Mass:
4. Hydrogen gas can be produced through the following reaction.
Mg (s) + HCl (aq) MgCl2 (aq) + H2 (g)
a. How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?
b. What is the mass in grams of H2 gas when 4.0 moles of HCl is added to the reaction?
5. Acetylene gas (C2H2) is produced as a result of the following reaction.
CaC2 (s) + H2O (l) C2H2 (g) + Ca(OH) 2 (aq)
a. If 3.20 moles of CaC2 are consumed in this reaction, how many grams of H2O are needed?
b. How many grams of Ca(OH) 2 would be formed with 3.20 moles of CaC2?
6. Laughing gas (nitrous oxide, N2O) is sometimes used as an anesthetic in dentistry. It is produced
when ammonium nitrate is decomposed according to the following reaction.
NH4NO3 (s) N2O (g) + H2O (l)
a. How many moles of NH4NO3 are required to produce 33.0 grams of N2O?
b. How many moles of water are produced with 45.0 grams of N2O?
Mass-to-Mass:
7. NaCl + KOH KCl + NaOH
How many grams of NaOH will be produced if 15g of NaCl reacts with KOH?
8. KClO3 KCl + O2
How many grams of oxygen are produced by the decomposition of 10.0 grams of potassium
chlorate?
9. Zn + HCl ZnCl2 + H2
How many grams of hydrogen are produced from the reaction of 17.5 grams of zinc?
10. Tin(II) fluoride, SnF2, is used in some toothpastes. It is made by the reaction of tin with hydrogen
fluoride according to the following equation.
Sn + 2HF SnF2 + H2
How many grams of SnF2 are produced from the reaction of 30.0 g of HF with Sn?
pf2

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CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!

CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!

Stoichiometry Practice Problems

**Balance the following equations FIRST, then answer the questions:

Mole-to-Mole:

  1. N 2 + H 2  NH 3 How many moles of hydrogen are needed to completely react with 2.0 moles of nitrogen?
  2. C 3 H 8 + O 2  CO 2 + H 2 How many moles of oxygen are necessary to react completely with 4.0 moles of propane (C 3 H 8 )?
  3. K 3 PO 4 + Al(NO 3 ) 3  KNO 3 + Al PO 4 How many moles of potassium nitrate are produced when 2.0 moles of potassium phosphate react with aluminum nitrate?

Mole-to-Mass:

  1. Hydrogen gas can be produced through the following reaction. Mg (s) + HCl (aq)  MgCl 2 (aq) + H 2 (g) a. How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium? b. What is the mass in grams of H 2 gas when 4.0 moles of HCl is added to the reaction?
  2. Acetylene gas (C 2 H 2 ) is produced as a result of the following reaction. CaC 2 (s) + H 2 O (l)  C 2 H 2 (g) + Ca(OH) 2 (aq) a. If 3.20 moles of CaC 2 are consumed in this reaction, how many grams of H 2 O are needed? b. How many grams of Ca(OH) 2 would be formed with 3.20 moles of CaC 2?
  3. Laughing gas (nitrous oxide, N 2 O) is sometimes used as an anesthetic in dentistry. It is produced when ammonium nitrate is decomposed according to the following reaction. NH 4 NO 3 (s)  N 2 O (g) + H 2 O (l) a. How many moles of NH 4 NO 3 are required to produce 33.0 grams of N 2 O? b. How many moles of water are produced with 45.0 grams of N 2 O?

Mass-to-Mass:

  1. NaCl + KOH  KCl + NaOH How many grams of NaOH will be produced if 15g of NaCl reacts with KOH?
  2. KClO 3  KCl + O 2 How many grams of oxygen are produced by the decomposition of 10.0 grams of potassium chlorate?
  3. Zn + HCl  ZnCl 2 + H 2 How many grams of hydrogen are produced from the reaction of 17.5 grams of zinc?
  4. Tin(II) fluoride, SnF 2 , is used in some toothpastes. It is made by the reaction of tin with hydrogen fluoride according to the following equation. Sn + 2HF  SnF 2 + H 2 How many grams of SnF 2 are produced from the reaction of 30.0 g of HF with Sn?

CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!

CLASS SET!! DO NOT WRITE ON! DO NOT TAKE! CLASS SET!!

Stoichiometry with Molarity:

  1. AgNO 3 + CaCl 2  Ca(NO 3 ) 2 + AgCl If 250. mL of 0.500M AgNO 3 are added to CaCl 2 , how many grams of AgCl will be produced?
  2. CsBr + Al(OH) 3  AlBr 3 + CsOH a. If 25 g of AlBr 3 was produced when 125 mL of a CsBr solution was added, what was the molarity of the CsBr solution? b. How many mL of 0.50 M CsBr are required to produce 100 g of NaOH?
  3. H 2 SO 4 + NaOH  Na 2 SO 4 + H 2 O a. Balance this equation b. What mass of H 2 SO 4 would be required to react with 0.75 mol of NaOH? c.
  4. In a spacecraft, the carbon dioxide exhaled by astronauts can be removed by its reaction with lithium hydroxide, LiOH, according to the following chemical equation. CO 2 (g) + 2LiOH(s)  Li 2 CO 3 (s) + H 2 O(l) If 1.20x10^24 molecules of CO 2 is exhaled, the average amount exhaled by a person each day, how much (in grams) Li 2 CO 3 (s) is produced?