Stoichiometric Calculations Worksheet

Stoichiometric Calculations

Read each question carefully and show all your work. Use appropriate units and significant figures in your final answers. Refer to the periodic table for atomic masses.

Mole-to-Mole Calculations

1. Consider the balanced chemical equation: 2H₂(g) + O₂(g) → 2H₂O(l) If 4.0 moles of H₂ react completely, how many moles of H₂O are produced?

2. For the reaction: N₂(g) + 3H₂(g) → 2NH₃(g) How many moles of N₂ are required to produce 10.0 moles of NH₃?

Mass-to-Mass Calculations

3. The combustion of propane (C₃H₈) is represented by the equation: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g) If 22.0 g of propane are burned, what mass of carbon dioxide is produced?

4. In the reaction 2KClO₃(s) → 2KCl(s) + 3O₂(g), how many grams of oxygen can be produced from 50.0 g of KClO₃?

Limiting Reactant

5. Given the reaction: 2Al(s) + 3Cl₂(g) → 2AlCl₃(s) If 54.0 g of aluminum reacts with 71.0 g of chlorine gas, identify the limiting reactant.

6. Using the information from question 5, calculate the theoretical yield (in grams) of aluminum chloride (AlCl₃).

True/False

7. The coefficients in a balanced chemical equation represent the mole ratio of reactants and products.

8. The limiting reactant is the reactant that is completely consumed in a chemical reaction.

Fill-in-the-Blanks

9. Stoichiometry is the study of the   relationships between reactants and products in a chemical reaction.

10. The actual yield of a reaction is usually   than the theoretical yield.