Mixed Stoichiometry II (CHEM 1405)

Back to Chemistry 1405 Practice Problems

Balance the following equations, and then solve the corresponding problems.  Follow the rules for significant digits. Show all calculations.

1.      C4H10      +      O2      Arrow.png      CO2      +      H2O

a) What mass of O2 will react with 400.0 g C4H10?

 

 

b) How many moles of water are formed in a)?

 

 

 

2.      HCl      +      Al(OH)3      Arrow.png      H2O      +      AlCl3

How many grams of aluminum hydroxide will react with 5.3 moles of HCl?

 

 

 

3.      Ca(ClO3)2      Arrow.png      CaCl2      +      O2

What mass of O2 results from the decomposition of 1.00 kg of calcium chlorate?

 

 

 

4. The reaction of Ca with water can be predicted using the activity series.  What mass of water is needed to completely react with 2.35 g of Ca?

 

 

 

5. Lead II nitrate reacts with potassium iodide to form lead II iodide and potassium nitrate.

a) Write the balanced equation for this reaction

 

b) How many moles of lead II iodide would be produced if 113 g of KI reacted with excess lead II nitrate?

 

 

c) How many grams of lead II nitrate would be needed to react with 113 g of KI?

 

 

 

6. Sulfuric acid (hydrogen sulfate) is made by reacting sulfur trioxide with water.

a) Write the balanced equation for the reaction stated above.

 

b) How many grams of sulfur trioxide would be needed to react with 4.23 mol H2O?

 

 

c) How many grams of sulfur trioxide would be needed to produce 2023 grams of sulfuric acid?