Stoichiometry Practice Problems

Chemistry Name Period Stoichiometry Practice Problems

1. In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of glucose is produced?

2. Ammonia, NH3, is a typical ingredient to household cleaners. It is produced through a combination reaction involving N2(g) and H2(g). If 12.0 mol of H2(g) react with excess N2(g), how many moles of ammonia are produced?

3. The compound tin(II) fluoride, or stannous fluoride, once was a common ingredient in toothpaste. It is produced according to the following reaction: Sn(s) + 2 HF(g) → SnF2(s) + H2(g) If 45.0 grams of HF react with tin metal, how many grams of stannous fluoride are produced?

4. The combustion of methane, CH4(g), can be described by the following unbalanced equation: CH4(g) + O2(g) → CO2(g) + H2O(g) If 150 moles of carbon dioxide are produced, what mass, in grams, of methane is required?

5. Acetylene gas (C2H2) is used in welding and produces an extremely hot flame according to the reaction: C2H2(g) + O2(g) → 4CO2(g) + H2O(g) If 5.00 x 104 g of acetylene burn completely, how many grams of carbon dioxide are produced?

6. How many grams of CO are needed to react with an excess of Fe2O3 to produce 558 g Fe? The equation for the reaction is: Fe2O3(s) + 2 CO(g) → 3 CO2(g) + 2 Fe(s)

7. How many grams of butane (C4H10) must be burned in an excess of O2 to produce 15.0 g of CO2? 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g)

8. How many liters of O2 are needed to react completely with 10.0 L of H2S at STP according to the following reaction? H2S(g) + 3 O2(g) –→ SO2(g) + H2O(g)

9. Given the following reaction, H2SO4(aq) + Ca3(PO4)2(s) –→ CaSO4(s) + H3PO4(aq), 5 if 1.25 x 10 kg of sulfuric acid react, how many kilograms of phosphoric acid are produced?

10. Calculate the mass of silver needed to react with chlorine to produce 84 g of silver chloride. Hint: Write a balanced equation first.

11. How many grams of Cu would be needed to completely react with 2.0 mol HNO3? The balanced equation is 3 Cu(s) + 8 HNO3(aq) –→ 3 Cu(NO3)2(s) + 2 NO(g) + 4 H2O(l)