Ratios and the Mole

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

• 10:6 
• 3:4
• 4:3
• 2:3

Tags

NGSS.HS-PS1-7

What is the mole ratio of H2O to H3PO4 in the following chemical equation?   P4O10 + 6 H2O --> 4 H3PO4 

• 6:4
• 4:6
• 1:3
• 3:1

Tags

NGSS.HS-PS1-7

Given the reaction: 4Al + 3O₂ --> 2Al₂O₃
How many moles of Aluminum oxide do you have if you have 2 moles of Al?

• 3 mole
• 2 mole
• 1 mole
• 0.5 mole

Tags

NGSS.HS-PS1-7

N₂ +  3H₂ → 2NH₃ 
What is the mole ratio between Nitrogen and Ammonia the above reaction?

• 1 moles NH₃ / 2 moles N₂ 
• 2 moles NH₃ / 1 moles N₂ 
• 2 moles N₂ / 3 moles NH₃ 
• 1 moles N₂ / 3 moles NH₃ 

16Na + S8 -->8Na₂S
What is the total number of moles of S8 that reacts when 4.0 moles of Na were completely consumed?

• 1
• 2
• 0.5
• 0.25

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂-->4NO + 6H₂O
What is the total number of moles of H₂O produced when 12 moles of NH₃ is completely consumed?

• 15
• 18
• 20
• 24

Tags

NGSS.HS-PS1-7

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ --> 2NH₃
How many moles of N₂ is needed to react with 6 moles of H₂?

• 6.7
• 2.0
• 3.0
• 15.0