1. MOLE MATH
COUNTING BY WEIGHING

2. The Mole Relates the mass of a substance to
the number of particles present.
It is a counting unit … like the dozen. A set number!
1 dozen = ?
1 Mole = ?

3. The mole is a counting unit similar to 1 dozen
1 dozen = 12 eggs
1 mole =
1 mole = 6.02 x atoms
6.02 x is commonly referred to as Avogadro’s number.

4. Avagadro’s Number Why is 6.02 x 10 23 atoms called Avagadro’s number?
Amedeo Avagadro did not propose the number.
It was named in his honor by Jean Perrin in 1909.
Number first proposed by Johann Josef Loschmidt

5. If we had Avogadro’s number of avocados?
That would make a whole lot of GUACAMOLE!!!!
How many avocados in a mole?

6. It works like a Conversion Factor!
1 doz. Large eggs have a mass of 1 kg
Do 1 doz. Small eggs have a mass 1 kg??
If I have 2 kg of large eggs, How many do I have?
Counting by MASS

7. 12.01 grams of Carbon = 1 mole of atoms How many atoms is this?
x1023 atoms
How many grams of Pb equal 1 mole?
1 mole of a more massive atom is going to have a greater mass…RIGHT?

8. Molar Mass…very important idea!
The mass of 1 mole of an element.
The atomic mass stated in grams.
FOUND ON PERIODIC TABLE.
Allows us to convert between mass and number of moles.

9. The mass of one mole =? The mass of 1 mole calcium =
The mass of 1 mole calcium = g
The mass of 1 mole sodium =
The mass of 1 mole sodium = g
The mass of 1 mole potassium =
The mass of 1 mole potassium = g
The atomic mass stated in grams = the mass of 1 mole.

10. For Carbon
12.01 g = 1 mole
Calculate the number of moles in g of carbon.
Calculate the number of grams in 2.4 moles of carbon.

11. Try the following…
1. What is the mass of 1 mole of each of the following elements?
Calcium, Aluminum, Chlorine, Krypton.
2. How many moles are contained in 32 grams of nitrogen?
3. How many atoms are in 6.6 moles of iron?
4. What is the mass of 2.6 x 1015 atoms of neon?