Stoichiometry Review

Given the reaction: 4Al + 3O₂ --> 2Al₂O₃

How many moles of Aluminum oxide do you have if you have 6 moles of O₂?

• 3 mole

• 2 mole

• 4 mole

• 1 mole

1 P₄ + 3 O₂ --> 1 P₄O₆

What is the excess reactant if 12 moles of P₄ react with 15 moles of O₂?

• P₄

• O₂

• P₄O₆

• none of the above

CH₄  +  2O₂  →  CO₂  +  2H₂O
24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

• 66 grams
• 132 grams
• 33 grams
• 8.72

When reacting Na with Cl₂, we calculated that the theoretical yield should be 47.5 grams. Our actual yield was 39.8 grams. What is the percent yield?

• 90.4%

• 81.2%

• 83.8%

• 1.04%

The reactant that is completely used up in a chemical reaction is called the __________ .

• spectator reagent

• limiting reagent

• excess reagent

• catalyst

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?

1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

When calculating theoretical yield, we start by using...

• our excess reagent

• our limiting reagent

• the mass of all of the reactants added together

• the mass of all of the products added together

How do we find the excess reagent?

• It is the reactant that will be left over after the reaction is complete

• It is the reactant that is completely used up during the reaction

• It is always the reactant with a larger molar mass

• It is always the reactant with a smaller molar mass

If I have 12 slices of bread, and 13 slices of cheese, what is my theoretical yield of grilled cheese sandwiches?

• 6 sandwiches

• 12 sandwiches

• 16 sandwiches

• 7.5 sandwiches

N₂ + 3H₂ --> 2NH₃
What is the total number of moles of NH₃ produced when 10 moles of H₂ reacts completely with N₂?

• 6.7
• 2.0
• 3.0
• 15.0