1. The Mole
6.02 x 1023

2. Which one doesn’t belong?
Dozen
Couple
Few
Baker’s Dozen
Ten

3. Key Point #1: The Mole Avogadro’s Number
Mole- number standing for 6.02 x particles
Tells us how many particles of a compound are actually involved in a reaction
1 mole = 6.02 x particles
602,000,000,000,000,000,000,000 particles
Avogadro’s Number

4. Mole Samples 1 mole of water = how many particles?
1 mole of sugar = how many particles
6.02 x particles = how many moles?

5. Similar to a Dozen
Similar to a dozen, except instead of 12, it’s 6.02 X 1023
1 dozen cookies = 12 cookies
1 mole of cookies = 6.02 X 1023 cookies
1 dozen cars = 12 cars
1 mole of cars = 6.02 X 1023 cars
1 dozen Al atoms = 12 Al atoms
1 mole of Al atoms = 6.02 X 1023 atoms
The NUMBER is always the same, but the MASS is very different!

6. Learning Check
Suppose we invented a new collection unit called a rapp. One rapp contains 8 objects.
1. How many paper clips in 1 rapp?
a) 1 b) 8 c) 9
2. How many oranges in 2.0 rapp?
a) 4 b) 8 c) 16
3. How many rapps contain 40 gummy bears?
a) 4 b) 5 c) 8

7. The Scale of a Mole A dozen eggs would make a HUGE omelet!
A mole of eggs would make an omelet big enough to cover the Earth thirty times!

8. Why such a BIG unit? Atoms and Molecules are TINY!
A drop of water contains 10 trillion water particles!

9. Moles and Particles 6.02 x 1023 makes a chemist’s life a lot easier
It’s impossible to keep track of one atom
so scientist discovered this number that gives us the molar mass of an atom
Molar mass is the mass of 6.02 x 1023 particles of a given substance
Mass is given in grams

10. Mole Calculations Moles Particles (smaller number) (larger number)
Multiply by Avogadro’s Number
Moles
(smaller number)
Particles
(larger number)
Divide by Avogadro’s Number

11. Example
A lab experiment calls for 2.00 moles of Calcium. How many particles of Calcium are required?
Use Dimensional Analysis
Given information
Conversion factor
2 moles Calcium
6.02 x 1023 particles
= 1.20 x 1024 particles Ca
1 mole Calcium

12. Learning Check
You have 12.04x1023 atoms of sulfur. How many moles of sulfur do you have?
Given
Conversion factor
= moles S

13. Key Point #2: Molar Mass
Molar Mass = the mass of 1 mole of a substance
Tells what mass of a substance is used in a reaction

14. EXIT TICKET How many particles are in a mole?
Determine the Molar Mass for the following problems. Don’t forget your UNITS!
a. Helium (He)
b. KCl4
c. Cu(OH)2

15. Using Dimensional Analysis
If I have 20 Dollars, and the cost of a hat is 4 dollars, how many hats can I buy?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
20 Dollars
1 hat
(20/4) hats
5 hats
4 Dollars

16. Grams  Moles
If I have 20 grams of helium, how many moles of helium do I have?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
Given
Conversion factor
20 grams He
1 mole He
(20/4) moles He
5 moles He
4 grams He