Limiting Reactant Quiz

Nitric acid can be neutralized by any base to form a salt and water, as in the following equation:

Mg(OH)₂ + 2 HNO₃ → Mg(NO₃)₂ + 2 H_­2O

How much magnesium nitrate salt will be formed by the reaction of 250 g magnesium hydroxide with 250 g nitric acid?

• 294 g

• 636 g

• 147 g

• 318 g

The following chemical equation represents a reaction that we will do in the lab next quarter:

Mg (s) + 2 HCl (aq) → MgCl₂ (aq) + H₂ (aq)

How many grams of excess reagent will be left over when 6.00 g of HCl reacts with 5.00 g of Mg?

(hint: determine the limiting reagent first )

• 4 g

• 1 g

• 2 g

• 3 g

4NH₃ + 5O₂ --> 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen? 

• 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

3CaCO₃ + 2FePO₄ --> Ca₃(PO₄)₂ + Fe₂(CO₃)₃

Assuming we start with 100 g of CaCo3 and 45 g of FePO4, identify the limiting reagent.

• iron(V) phosphate

• calcium carbonate

• iron(III) phosphate

• calcium(II) carbonate

Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?

• Fe
• S
• FeS
• none 

CH₄ + 2H₂O --> CO₂ + 4H₂
What is the limiting reactant when 20g CH₄ react with 15g H₂O?

• CH₄
• H₂O
• CO₂
• H₂