Limiting Reactant Quiz

What is a limiting reactant?

• the reactant that determines how much product can be made
• the reactant that is in excess
• the product that you can make the most of
• the amount of reactants that react with each other

How much water can be made if 8 moles of NH₃ react with 6 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

• 5 moles

• 6 moles

• 12 moles

• 18 moles

In a balanced equation, the ratio between the coefficient of any two substances is called the _______.

• mole ratio

• stoichiometry

• limiting reactant

• excess reactant

In the image, which reactant is limiting?

• The white molecules, because there are extra.

• The black atoms, because they are completely used up.

• The white molecules, because they are completely used up.

• The black atoms, because there are extra.

A student burns 1.50 mol C₃H₈ according to the following reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

How many grams of carbon dioxide are produced?

• 44.0 g

• 66.1 g

• 132 g

• 198 g

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3
• Cl2
• Al

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Avogadro's Number

4NH₃ + 5O₂ → 4NO + 6H₂O

Based on reaction above, oxygen is a limiting reactant. Calculate the mass of NO formed if the mass of oxygen reacted is 1.80g.

• 0.37g

• 0.045g

• 1.35g

• 11.1g

3NH₄NO₃ + Na₃PO₄ --> (NH₄)₃PO₄ + 3 NaNO₃

Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, identify the limiting reactant.

• ammonium phosphate

• sodium phosphate

• ammonium nitrate

• sodium nitrate