1. IPS Unit 12 Stoichiometry Section 2 The Mole

2. Unit 12 – Section 2: The Mole

3. The Mole What is a dozen? Can you have a dozen cookies?
Unit 12 – Section 2: The Mole
The Mole
What is a dozen?
Can you have a dozen cookies?
Can you have a dozen pencils?
If you have a dozen cars, how many do you have?
What is a dozen?

4. Mole is abbreviated mol
Unit 12 – Section 2: The Mole
The Mole
What is a Mole?
A counting number/unit (like a dozen)
1 mol = 6.02x1023 items
6.02 X 1023 (in scientific notation))
602 billion trillion
602,000,000,000,000,000,000,000
Mole is abbreviated mol

5. The Mole How big is a mole? Unit 12 – Section 2: The Mole
1 mole of hockey pucks would equal the mass of the moon!
1 mole of basketballs would fill a bag the size of the earth!
1 mole of pennies would cover the Earth 1/4 mile deep!
1 mole of soft drink cans would cover the surface of the earth to a depth of over 200 miles.
1 mole unpopped popcorn kernels spread across the United States of America would cover the country to a depth of over 9 miles.

6. The Mole Dozens vs. Moles 1 dozen cookies = 12 cookies
Unit 12 – Section 2: The Mole
The Mole
Dozens vs. Moles
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
Note that the NUMBER is always the same, but the MASS is very different!

7. Chocolate Chip Cookies!!!
Unit 12 – Section 2: The Mole
Chocolate Chip Cookies!!!
1 cup butter 2 eggs
1/2 cup white sugar 2 ½ cups flour
1 cup packed brown sugar 1 teaspoon baking soda
1 teaspoon vanilla extract 1 teaspoon salt
2 cups semisweet chocolate chips
Makes 3 dozen
How many eggs are needed to make 3 dozen cookies?
How much butter is needed for the amount of chocolate chips used?
How many eggs would we need to make 9 dozen cookies?
How much brown sugar would I need if I had 1 ½ cups white sugar?
Mole Ratio = moles of one substance to moles of another substance

8. Chocolate Chip Cookies!!!
Unit 12 – Section 2: The Mole
Chocolate Chip Cookies!!!
1 cup butter + ½ cup sugar + 1 cup brown sugar + 1 teaspoon vanilla + 2 eggs + 2 ½ cups four + 1 teaspoon baking soda + 1 teaspoon salt + 2 cups chocolate chips
(177ºC)
COOKIES
(a synthesis reaction)

9. Unit 12 – Section 2: The Mole
Cookies and Chemistry?!?!?
Just like chocolate chip cookies have recipes, chemists have recipes as well
Instead of calling them recipes, we call them chemical equations
Furthermore, instead of using cups and teaspoons, we use grams and moles
Lastly, instead of eggs, butter, sugar, etc. we use chemical compounds as ingredients

10. Formula Mass the mass in grams of one mole of a substance
Unit 12 – Section 2: The Mole
Formula Mass
the mass in grams of one mole of a substance
the formula mass and the atomic mass of an element are related:
1 atom Na = 23.0 amu Na
1 mole Na = 23.0 g Na
Formula mass is used to convert between mass of a substance and number of moles

11. Molar Mass Conversions
Unit 12 – Section 2: The Mole
Molar Mass Conversions
Using the Formula Mass for a compound, and knowing that there is one mole for the Formula Mass, we can preform conversion calculations between moles and grams

12. Molar Mass Conversions
Unit 12 – Section 2: The Mole
Molar Mass Conversions
Conversion Guidelines
Start with what you are given.
Let the units guide you.
The units will tell you if grams or moles goes on top.
Multiply the top; multiply the bottom; top divided by the bottom

13. Molar Mass Conversions
Unit 12 – Section 2: The Mole
Molar Mass Conversions
EX1: If you have 25g of NaCl, how many moles of NaCl do you have?
25g NaCl 1
mol NaCl 25
58.5 =
58.5
g NaCl
= 0.43 mol NaCl
NaCl
Na 1 x 23.0 = 23.0
Cl 1 x 35.5 = 35.5
58.5 g NaCl

14. Molar Mass Conversions
Unit 12 – Section 2: The Mole
Molar Mass Conversions
EX1: If you have 3.2 mols of NaCl, how many grams do you have?
3.2mol NaCl
58.5
g NaCl
187.2 1 = 1
mol NaCl
= g NaCl
NaCl
Na 1 x 23.0 = 23.0
Cl 1 x 35.5 = 35.5
58.5 g NaCl