Mole Ratios and Molar Masses

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 can be determined from a balanced chemical equation?

• Mole ratio of any two substances in the reaction
• Energy released in the reaction.
• Electron configuration of all elements in the reaction. 
• Mechanism involved in the reaction. 

Tags

NGSS.HS-PS1-7

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

How many moles of aluminum oxide (Al₂O₃) are produced if you have 2 moles Al?

• 3 mole

• 2 mole

• 1 mole

• 0.5 mole

N₂ + 3 H₂ → 2 NH₃

What is the mole ratio between nitrogen and ammonia in the above reaction?

• 1 : 2

• 2 : 1

• 2 : 3

• 1 : 3

Tags

NGSS.MS-PS1-5

2 Na + S --> Na₂S

What is the total number of moles of S that reacted when 1 mole of Na was completely consumed?

• 0.1

• 0.5

• 0.4

• 2

4 NH₃ + 5 O₂--> 4 NO + 6 H₂O

What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed in an excess of oxygen?

• 15

• 18

• 20

• 24

Tags

NGSS.HS-PS1-7

6 CO₂ + 6 H₂O --> C₆H₁₂O₆ + 6 O₂

What is the total number of moles of water needed to produce 2.5 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Tags

NGSS.MS-PS1-5

NGSS.MS-LS1-6

CS₂ + 3 O₂ --> CO₂ + 2 SO₂

6.3 moles CS₂ reacts in excess oxygen. How many moles SO₂ gas will be produced?

• 2.25 moles SO₂

• 4.5 moles SO₂

• 45 moles SO₂

• 12.6 moles SO₂

Tags

NGSS.HS-PS1-7

What are the missing coefficients for the unbalanced equation below?

2 AlPO₄ + ____Ba(OH)₂ → ____Al(OH)₃ + Ba₃(PO₄)₂

• 1, 1

• 2, 2

• 3, 2

• 2, 1

Tags

NGSS.HS-PS1-7

Molar mass is the

• atomic mass of atoms that has the most number in a compound

• sum of the atomic masses of all atoms in a compound expressed in grams per mol(g/mol)

• amount of moles in a compound

• sum of the atomic masses of all atoms in a compound expressed in amu.