Mole Ratio and 1 Step Stoichiometry

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

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 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

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 number should be in front of each substance in the chemical equation?

___N₂+___F₂ --> ___ NF₃

• 1, 2, 3

• 2, 1, 3

• 1, 3, 2

• 3, 1, 2

Tags

NGSS.HS-PS1-7

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

For the following reaction, how many moles of silver (Ag) is produced, if 10 moles of silver nitrate (AgNO₃) is completely reacted during the reaction?
2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

• 2 moles
• 2.5 moles
• 5 moles
• 10 moles

Answer explanation

Tags

NGSS.HS-PS1-7

For the following reaction, how many moles of pure copper (Cu) is need to produce 8 moles of pure silver (Ag)?

2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

• 1 moles

• 2 moles

• 4 moles

• 8 moles

Answer explanation

Tags

NGSS.HS-PS1-7