Mole Ratios

Balance this equation.
_SnO₂ +_H₂-->_Sn +_H₂O

• 1,1,2,1
• 1,2,1,1
• 1,2,1,2
• 1,2,2,1

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

What is the mole ratio between oxygen and water?

2 C₄H₁₀ + 9 O₂ → 8 CO₂ + 10 H₂O

• 2:8

• 1:4

• 10:9

• 9:10

Answer explanation

Use the coefficients to find mole ratios.

Tags

NGSS.HS-PS1-7

2Na + S -->Na₂S

What is the total number of moles of S that reacts when 0.4 moles of Na were completely consumed?

• 0.1

• 0.2

• 0.4

• 2

S₈ + 12 O₂ → 8 SO₃

How many moles of S₈ is needed to produce 12 moles of SO₃?

• 1

• 1.5

• 2

• 12

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

How many moles of CO₂ is produced when 3 moles of H₂O is also produced?

• 2

• 3

• 4

• 4.5

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ → 2NH₃

How many moles of N₂ is needed to produce 3.5 moles of NH₃?

• 1

• 1.5

• 1.75

• 3

Tags

NGSS.HS-PS1-7

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

How many moles of CO₂ is produced when 17.5 moles of O₂ reacts fully?

• 4

• 7

• 10

• 30.63

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

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Tags

NGSS.HS-PS1-7