Find the limiting reactant and how much product forms

Question 1

2Na + Cl₂ → 2NaCl. 5 mol of sodium reacts with 9 mol of chlorine. What is the maximum amount of sodium chloride that can form, in mol? Give 2 decimal places if needed.

Answer mol

Question 2

2H₂ + O₂ → 2H₂O. 1 mol of hydrogen is mixed with 6 mol of oxygen. Which is the limiting reactant?

• A. hydrogen
• B. oxygen

Question 3

Why is one reactant often used in excess in industry?

• A. To make the product impure on purpose
• B. To make sure all of the more expensive reactant reacts
• C. To slow the reaction down
• D. Because excess reactants are free

Question 4

CH₄ + 2O₂ → CO₂ + 2H₂O. 5 mol of methane reacts with 3 mol of oxygen. What is the maximum amount of carbon dioxide that can form, in mol? Give 2 decimal places if needed.

Answer mol

Question 5

CH₄ + 2O₂ → CO₂ + 2H₂O. 1 mol of methane is mixed with 3 mol of oxygen. Which is the limiting reactant?

• A. methane
• B. oxygen

Question 6

In a car engine with too little air, which reactant is limiting and what is the risk?

• A. oxygen is limiting, so incomplete combustion makes carbon monoxide
• B. nothing is limiting
• C. fuel is limiting, so too much oxygen forms
• D. nitrogen is limiting, so no reaction happens

Question 7

CH₄ + 2O₂ → CO₂ + 2H₂O. 4 mol of methane reacts with 4 mol of oxygen. What is the maximum amount of carbon dioxide that can form, in mol? Give 2 decimal places if needed.

Answer mol

Question 8

2Na + Cl₂ → 2NaCl. 1 mol of sodium is mixed with 2 mol of chlorine. Which is the limiting reactant?

• A. sodium
• B. chlorine

Question 9

Why is one reactant often used in excess in industry?

• A. Because excess reactants are free
• B. To make the product impure on purpose
• C. To make sure all of the more expensive reactant reacts
• D. To slow the reaction down

Question 10

2H₂ + O₂ → 2H₂O. 1 mol of hydrogen reacts with 2 mol of oxygen. What is the maximum amount of water that can form, in mol? Give 2 decimal places if needed.

Answer mol

Question 11

2H₂ + O₂ → 2H₂O. 3 mol of hydrogen is mixed with 9 mol of oxygen. Which is the limiting reactant?

• A. hydrogen
• B. oxygen

Question 12

Magnesium ribbon is added to acid until bubbling stops and some magnesium is left. Which reactant was limiting?

• A. the magnesium
• B. neither
• C. the acid
• D. the hydrogen

Question 13

Mg + 2HCl → MgCl₂ + H₂. 6 mol of magnesium reacts with 6 mol of hydrochloric acid. What is the maximum amount of hydrogen that can form, in mol? Give 2 decimal places if needed.

Answer mol

Question 14

CH₄ + 2O₂ → CO₂ + 2H₂O. 5 mol of methane is mixed with 4 mol of oxygen. Which is the limiting reactant?

• A. methane
• B. oxygen

Question 15

Doubling the amount of the reactant in excess will…

• A. stop the reaction
• B. not change the amount of product
• C. double the product
• D. halve the product

Question 16

CH₄ + 2O₂ → CO₂ + 2H₂O. 5 mol of methane reacts with 6 mol of oxygen. What is the maximum amount of carbon dioxide that can form, in mol? Give 2 decimal places if needed.

Answer mol