1. The MOLE!

2. What is a mole?
By definition, a mole is: ___________________________________. Let’s put this in useful terms for us.
Atoms, molecules and ions are very, very _____________, so we need something to enable us to measure them.
Just like a _____________ eggs represents _________ eggs, one mole represents ________________ of anything.
# of atoms in 12 g of carbon-12
small
dozen 12
6.02 x 1023

3. What is a mole?
6.02 x 1023 of anything is otherwise known as a _______________________.
MOLE

4. So, one dozen paperclips would be how many paperclips? ________
One mole of paperclips would be how many paperclips? __________
One dozen nitrogen atoms would be how many nitrogen atoms? __________
One mole of nitrogen atoms would be how many nitrogen atoms? __________
One dozen water molecules would be how many water molecules? _________
One mole of water molecules is how many water molecules? ___________ 12
6.02 x 1023 12
6.02 x1023 12
6.02x1023

5. We have the dreaded return of…..
CONVERSION FACTOR PROBLEMS!

6. Example #1
How many moles of calcium (Ca) would we have if we have x 1024 calcium atoms?

7. Example #2
How many molecules are there in 6 mol of H2SO4?

8. Finding the mass of one mole of an atom or molecule.
To find out how much one mole weighs for an atom, you can go to the periodic table and find that element’s ____________________________. This is also referred to as an element’s _________________________.
Average atomic mass
Molar mass

9. Finding the mass of one mole of an atom or molecule.
So, one mole of copper has a mass of ________________.
The molar mass of lead is ______________.
63.55 g
207.2 g

10. Now that you know how to find the mass of one mole of an atom, we can find the mass of one mole of a compound. Just like with atoms, we refer to this mass as ___________________.
molar mass

11. Let’s find the molar mass of water
Step 1. List the elements in the molecule/compound and the number of atoms you have for each element.
Step 2. Write the molar mass of each element and multiply it by the number of atoms
Step 3. Sum the masses for each element to get the molar mass.

12. Answer
The molar mass of water = ________________.
18.02 g

13. More Practice!
HCl

14. More Practice!
PCl3

15. More Practice!
N2O5

16. More Practice!
NaHCO3