Stoichiometry and Mole Ratios

What is Stoichiometry?

• Using the coefficients in a balanced reaction as mole ratios.

• Using the coefficients in an unbalanced reaction as mole ratios.

• Using the subscripts in an unbalanced reaction as mole ratios.

• Using the subscripts in a balanced reaction as mole ratios.

When 1 mole of CH₄ reacts, how many moles of O₂ is needed?

• 1

• 2

• 3

• 4

When 0.5 moles of O₂ reacts, how many moles of H₂O is produced?

• 0.25

• 0.5

• 1.0

• 2.0

When 16.0 moles of CO₂ was produced, how many moles of H₂O was also produced?

• 16.0

• 8.0

• 32.0

• 24.0

If 6.0 moles of H2O needed to be produced by the scientist, how many moles of each reactant does she need to begin with?

• 6.0 mol CH4

  12 mol O2

• 3.0 mol CH4

  6.0 mol O2

• 6.0 mol CH4

  6.0 mol O2

• 12 mol CH4

  6.0 mol O2

The scientist wants to react 1.0 mol of C3H8.

How many moles of O2 does she need? ​ (a)  

How many moles of CO2 will be produced? ​ (b)  

How many moles of H2O will be produced? ​ (c)  

• 5.0
• 3.0
• 4.0
• 1.0
• 2.0
• 6.0
• 0.5

The scientist wants to react 2.0 mol of C3H8.

How many moles of O2 does he need? ​ (a)  

How many moles of CO2 will be produced? ​ (b)  

How many moles of H2O will be produced? ​ (c)  

• 10
• 6.0
• 8.0
• 12
• 4.0
• 2.0

The scientist wants to react 3.18 mol of C3H8.

How many moles of O2 does she need? ​ (a)  

How many moles of CO2 will be produced? ​ (b)   ​

How many moles of H2O will be produced? ​​ (c)  

• 16.5
• 15.9
• 9.54
• 12.72
• 8.31
• 11.2
• 7.47

15.0 moles of O2 were used up in the chemical reaction. How many moles of each product were formed?

• 9.00 mol CO2

  12.0 mol H2O

• 12.0 mol CO2

  9.00 mol H2O

• 45.0 mol CO2

  60.0 mol H2O

• 3.00 mol CO2

  3.75 mol H2O

N₂ + 3 H₂ → 2 NH₃

What is the mole ratio between N₂ and H₂?