Practice Exercise

Chemical Calculations

1. Given the reaction:

2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O

where C₈H₁₈ is being used as a substitute for gasoline, calculate how many grams of oxygen, O₂, are required to react with one liter (780 grams) of gasoline.

Using the above reaction calculate how many grams of water, H₂O, are produced when one liter (780 grams) of gasoline are oxidized.

2. Given the reaction:

2 NaOH + (NH₄)₂SO₄ ---> Na₂SO₄ + 2 NH₄OH

Calculate the number of grams of ammonium sulfate required to react with 100 grams of sodium hydroxide.

Calculate the number of grams of ammonium hydroxide produced when 100 grams of sodium hydroxide react with ammonium sulfate.

3. Calculate the number of grams of NaHCO₃ required to prepare 500 mL of a 0.20 M NaHCO₃ solution?

4. How many millimoles of NaHCO₃ are in 400 mL of a 0.20 M NaHCO₃ solution?

5. How many grams of NaHCO₃ are in 400 mL of a 0.20 M NaHCO₃ solution?