Mole Ratio Problems

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

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-PS1-2

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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4NH₃ + 5O₂-->4NO + 6H₂O

How many moles of NO will be produced from 3.0 moles of oxygen gas?

• 3.75 moles

• 2.4 moles

• 0.374 moles

• 4 moles

Tags

NGSS.HS-PS1-7

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Tags

NGSS.HS-LS1-6

NGSS.HS-LS2-4

NGSS.HS-LS2-5

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

A problem asks how many moles of oxygen gas are needed to react completely with 21 moles of ethane (C₂H₆). What is the final answer for this problem to the correct number of significant figures?

• 6 mol C₂H₆

• 21 mol O₂

• 74 mol O₂

• 42 mol O₂

Tags

NGSS.HS-PS1-7

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

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

Tags

NGSS.HS-PS1-7

What is the definition of a mole ratio?

• The mole relationship between two substances in a balanced chemical equation

• The molar mass of two substances in a balanced chemical equation.

• The total number of moles of all substances in a balanced chemical equation.

• A fraction of a mole.

• None of these choices

Tags

NGSS.HS-PS1-7