Mole Ratios Quiz

If there are 5 boys and 7 girls, write the ratio of girls to boys.

• 5 to 7
• 7 to 5
• 5 to 12
• 7 to 12

What is the ratio of red apples to green apples

• 7 apples to 3 green

• 4 red apples to 7 apples

• 4 red apples to 3 green apples

• 3 green apples to 4 red apples

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

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

• 1 moles NH₃ / 2 moles N₂ 

• 3 moles NH₃ / 1 moles N₂ 

• 2 moles N₂ / 2 moles NH₃ 

• 1 moles N₂ / 2 moles NH₃ 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2Na + S → Na₂S

What is the ratio of Na₂S to Na?

• 1 mol Na₂S : 1 mol Na

• 1 mol Na₂S : 2 mol Na

• 2mol Na₂S : 1 mol Na

• 2 mol Na₂S : 2 mol Na

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂ → 4NO + 6H₂O

What is the mole ratio of water to oxygen?

• 4 mol H₂O : 4 mol O₂

• 4 mol H₂O : 5 mol O₂

• 6 mol H₂O : 4 mol O₂

• 6 mol H₂O : 5 mol O₂

Tags

NGSS.HS-PS1-7

1 P₄ + 3 O₂ → 2 P₂O₃

What is the mole ratio of P₄ to O₂?

• 1 mol P₄ : 3 mol O₂

• 1 mol P₄ : 2 mol O₂

• 3 mol P₄ : 2 mol O₂

• 3 mol P₄ : 1 mol O₂

Tags

NGSS.HS-PS1-7

3 CaCl₂ + 2 Na₃PO₄ → Ca₃(PO₄)₂ + 6 NaCl

What is the mole ratio of NaCl to Ca₃(PO₄)₂?

• 1 mol NaCl : 6 mol Ca₃(PO₄)₂?

• 6 mol NaCl : 1 mol Ca₃(PO₄)₂?

• 2 mol NaCl : 3 mol Ca₃(PO₄)₂?

• 3 mol NaCl : 2 mol Ca₃(PO₄)₂?

Tags

NGSS.HS-PS1-7