Mole Ratio

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-PS1-2

C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O. A problem asks how many moles of oxygen gas are needed to react completely with 6 moles of ethane (C₂H₆). What is the final answer for this problem?

• 13 mol C₂H₆

• 3 mol O₂

• 21 mol O₂

• 42 mol O₂

Tags

NGSS.MS-PS1-5

2Na + S -->Na₂S
What is the total number of moles of Na₂S produced when 8.0 moles of Na were completely consumed?

• 1

• 2

• 0.5

• 4

Tags

NGSS.HS-PS1-7

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

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

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6 mol H

• 2 mol H

• 3 mol H

• 1 mol H

Tags

NGSS.MS-PS1-5

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 8 moles

• 16 moles

• 2 moles

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

• 2 moles H₂ = 1 mole O₂

• 1 mole H₂ = 1 mole O₂

• 4 moles H₂ = 1 mole O₂

• 2 moles H₂ = 2 moles O₂

Tags

DOK Level 1: Recall

When looking at a chemical equation, what tells you the mole ratios?

• the subscripts (small numbers at the bottom)

• the element symbols

• the coefficients

• 15.0