1. The Mole A. Furry Animal B. Beauty mark D. Unit in Chemistry
C. Insider Spy

2. Lab samples contain large numbers of particles which are sometimes to large and inconvenient to work with.
Ex. We weigh 1 gram of Magnesium not particles of Magnesium!!!
Since atoms are too small to count we group them into a unit called the MOLE.

3. gross
dozen
pair
six-pack

4. 1 Mole is =
× 1023 particles
Approx: 602 trillion billion

5. The Mole A counting unit
The mole is exactly the number of atoms in 12 g of carbon
6.022 X atoms, molecules or formula units

6. The Mole 1 dozen cookies = 12 cookies
1 mole of cookies = X 1023 cookies
1 dozen Al atoms = 12 Al atoms
1 mole of Al atoms = X 1023 atoms
1 mole of CO2 = x molecules
1 mole of NaCl = x 1023 formula units
Note that the NUMBER is always the same, but the MASS is very different!

7. This number is called Avogadro’s number.
Avocado!
NOT
Amedeo Avogadro
( )
We use the symbol NA to represent Avogadro’s number.

9. Avogadro’s Number! But Where Did it Come From?
It was NOT just picked! It was MEASURED.
One of the better methods of measuring this number was the Millikan Oil Drop Experiment
Since then we have found even better ways of measuring using x-ray technology

10. Just How Big is a Mole?
Enough soft drink cans to cover the surface of the earth to a depth of over 200 miles.
If one mole of pennies was distributed equally among the six billion people on Earth, then each person would have 1 x 1012 dollars. In other words, everyone on earth would be a trillionaire!
If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole.

11. A Mole of Particles Contains 6.022 x 1023 particles
= x 1023 S atoms
= x 1023 H2O molecules
1 mole S
1 mole H2O

12. Molar Mass The Mass of 1 mole of a substance (in grams)
Equal to the numerical value of the average atomic mass (get from periodic table)
Symbol: MM
Units: ( g / mol )
1 mole of C atoms = g
1 mole of Mg atoms = 24.3 g
1 mole of Cu atoms = 63.5 g

13. Learning Check!
Determine the Molar Mass of Copper.
How many moles is this equal to?
How many atoms of copper is this equal to?
MMCu = g/mol
1 mole
6.022 x atoms of copper
1 mole = molar mass of the substance = Avogadro’s number

14. Learning Check! Molar Mass of K2O = ? Grams/mole
B. Molar Mass of antacid Al(OH)3 = ? Grams/mole

15. Learning Check
Prozac, C17H18F3NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. Find its molar mass.