Mole Ratios and Mole Conversions

Mole Ratios used for conversions are derived from:

• the molar mass of the reactants in the balanced chemical equation

• the coefficients of the balanced chemical equation

• the subscripts of the products in the balanced chemical equation

• the group number of each element in the balanced chemical equation

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

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

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Tags

NGSS.HS-PS1-7

4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂

Place the numbers in the correct spots to solve this problem: how many moles of FeS will be needed to produce 13.72 moles of Fe₂O₃?

g

h

i

e

7 mol O₂

2 mol FeS

2 mol Fe₂O₃

27.44 mol FeS

4 mol SO₂

13.72 mol FeS

4 mol Fe₂O₃

13.72 mol Fe₂O₃

4 mol FeS

6.86 mol FeS

Tags

NGSS.HS-PS1-7

4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂

Place the numbers in the correct spots to solve this problem: how many moles of SO₂ will be produced if you use 19.6 moles of O₂?

g

h

i

j

4 mol FeS

2 mol Fe2O3

34.3 mol SO2

19.6 mol O2

19.6 mol SO2

7 mol FeS

7 mol O2

11.2 mol SO2

2.8 mol SO2

4 mol SO2

Tags

NGSS.HS-PS1-7

4 FeS + 7 O₂ → 2 Fe₂O₃ + 4 SO₂

How many moles of O₂ will you need to react with 17.3 moles of FeS?

• 30.28 moles

• 9.89 moles

• 0.40 moles

• 39.33 moles

S₈ + 12 O₂ → 8 SO₃

How many moles of S₈ is needed to react with 3 moles of O₂?

• 0.25

• 1

• 4

• 36

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ → 2NH₃

How many moles of H₂ are needed to react with 2 moles of N₂?

S₈ + 12 O₂ → 8 SO₃

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

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

Tags

NGSS.MS-PS1-5