1. MOLE JOKES
Why is Avogadro so rich?
A: He's a multi-mole-ionare!
Why was there only one Avogadro?
A: When they made him, they broke e the Moled

2. MOLE CALCULATIONS
MOLE TIME

3. (converting between grams and moles)
Using Molar Mass:
(converting between grams and moles)
Remember has the units g/mol
Molar mass can be used as a conversion factor to convert between mass and moles (g and mol)
Steps:
Calculate the molar mass of the compound
Write it as a conversion factor (fraction)

4. Examples: What is the mass (in grams) of 3.25mol of carbon dioxide?
Carbon dioxide = CO2
Molar mass:
C: 1 x 12.0 = 12.0
O: 2 x 16.0 = 32.0
44.0g/mol

5. More Examples:
1. What is the mass in grams of 1.36x10-3 moles of SO3?
2. How many moles of N2 are there in 50.0g N2?
3. How many moles of CH3OH are there in 0.250g of CH3OH?

6. More Examples:
1. What is the mass in grams of 1.36x10-3 moles of SO3?
2. How many moles of N2 are there in 50.0g N2?
3. How many moles of CH3OH are there in 0.250g of CH3OH?

7. MOLE JOKES
What kept Avogadro in bed for two months?
A: Moleonucleosis
What did Avogadro invent for his wife to use as a night cream?
A: Oil of Molay

8. Using Avogadro’s Number:
(converting between moles and particles)
We know that there are…
So, Avogadro’s number can be a conversion
factor too!
Note: particles can be molecules, formula units

9. Examples:
1. How many moles of carbon are there in 3.01x1024 atoms of carbon?
2. How many molecules of Ag2O are present in 3.0 moles of silver oxide?

10. Examples:
1. How many moles of carbon are there in 3.01x1024 atoms of carbon?
2. How many molecules of Ag2O are present in 3.0 moles of silver oxide?

11. MOLE JOKES
Why did Avogadro stop going to a chiropractor on October 24th?
A: He was only tense to the 23rd!
What did the generous mole say when his friends crashed his party
A: The mole the merrier!
What happens when a mole bites a dog?
A: He becomes Moleicious!

12. Molar Volume of a Gas:
●In other words, this means…
● All gases with the same pressure, temperature and number of particles occupy the same volume!

13. What is Molar Volume? • The volume occupied by a gas under…
Standard Temperature and Pressure
STP = 0oC and 101.3kPa (1 atm)
This is another conversion factor!
Only at
STP!
Only at STP

14. Examples:
1. What is the volume occupied by 0.350mol of SO2(g)
at STP?
2. How many moles of gas are contained in a balloon
with a volume of 10.0L at STP?

15. Examples:
1. What is the volume occupied by 0.350mol of SO2(g)
at STP?
2. How many moles of gas are contained in a balloon
with a volume of 10.0L at STP?

16. MOLE JOKES
What is Avogadro's favorite day of the week?
A: Moleday
How would you describe a stinky chemist?
A: Mole-odorous

17. Other Conversions:
Atoms/molecules can also be a conversion factor
Example:
How many atoms are in 5 molecules of
CuSO4· 5H2O?
Note: these numbers are exact so sig figs aren’t
limited

18. Volume of a Solid or Liquid:
Other Conversions:
Volume of a Solid or Liquid:
Density (g/mL) is used as a conversion factor to
convert between mass and volume for solids and
liquids

19. Example:
What is the volume occupied by 3.00 mol of ethanol, CH3CH2OH(l)? (d=0.790g/mL)

20. Combined Conversions:

21. Combined Examples:
1. How many hydrogen atoms are in mol of
H3PO4?
2. How many molecules are in 78.54g of nitrogen
dioxide?
3. What is the mass of 4.83x1022 molecules of water?

22. Combined Examples:
1. How many hydrogen atoms are in mol of
H3PO4?
2. How many molecules are in 78.54g of nitrogen
dioxide?
3. What is the mass of 4.83x1022 molecules of water?
1.44 g H2O