1. The Mole!

2. Why We Use The Mole
Chemists work in the macroscopic world of grams and liters
But chemists are also interested in the microscopic world of atoms and molecules which are VERY, VERY small
The mole is the bridge from the microscopic world to the macroscopic world

6. 1 Mole
6.02 X 1023

7. Moles are used to tell us the amount of any substance.
24 cans
= 1 case
2 shoes, earrings, mittens
= 1 pair
12 donuts, roses, eggs
= 1 dozen
6.02 X 1023 molecules, atoms, ANYTHING
= 1 mole
Moles are used to tell us the amount of any substance.
1 mole Na = 6.02 X 1023 atoms of Na
1 mole Cl = 6.02 X 1023 atoms of Cl
1 mole NaCl = 6.02 X 1023 molecules of NaCl
1 mole of donuts = 6.02 X 1023 donuts

8. E. g. The average galaxy has 150 billion stars
E.g. The average galaxy has 150 billion stars. It is estimated that there are 125 billion galaxies in the universe. How many moles of stars in the universe?

9. E. g. It is estimated that there are 200 million insects per person
E.g. It is estimated that there are 200 million insects per person. There are approximately 7 billion people in the world. How many moles of insects are there in the world?

10. Practice Holy Moley Activity P. 168 #1-6
The Great Mole Hunt (tomorrow)