2. 6.02 X 10 23 representative particles The Mole (also known as Avogadro’s number!)

3. how big is a mole? how high would a stack of 1 mol of paper be? What do you call a tenth grader taking chemistry? A sophmole!

4. how big is a mole? who is the strongest person in class?

5. a mole of various substances

6. What’s a “representative particle”? -the type of unit present in a substance: atoms diatomic molecules molecules Examples: 1 mole H 2 O – 6.02 X 10 23 molecules H 2 O 1 mole Fe – 6.02 X 10 23 atoms Fe

7. On which American mountain was Avogadro’s face carved in stone? Mt. Rushmole! How many atoms are in 2.12 moles of propane (C 3 H 8 )? Known: # moles = 2.12 mol C 3 H 8 1 mol C 3 H 8 = 6.02 X 10 23 molecules C 3 H 8 1 molecule = 11 atoms (3C + 8H) 2.12 mole C 3 H 8 1 mole C 3 H 8 6.02 X 10 23 molecules C 3 H 8 11 atoms 1 molecule C 3 H 8 = 1.40 X 10 25 atoms

8. Try these: 1. How many atoms are in 1 mole of sucrose, C 12 H 22 O 11 ? 2. How many atoms of C are in 2 moles of C 12 H 22 O 11 ? 3. How many molecules are in 5 moles of C 12 H 22 O 11 ?

9. How big is a mole? What is the mass in kg of 6.02 X 10 23 moles? (one mole weighs about 150 grams) 9.03 X 10 22 kg !! That’s equal to: more than 1% of the earth’s mass! more than 1.3 times the moon’s mass! more than 60 times the combined mass of earth’s oceans!

10. What is the length of 6.02 X 10 23 moles in km? (a mole is about 15 cm) 9.03 X 10 19 km !! That’s equal to: the distance from earth to Alpha Centauri and back!! Wow! How did Avogadro get through the desert? He rode a camole!

11. Molar Mass The molar mass of a substance is the mass (in grams) of one mole of the substance. 1 mol C = 12.01 grams1 mol He = 4.003 grams 1 mol Ag = 107.9 grams 1 mol Ca = ?? grams 1 mol CH 4 = 16.04 grams1 mol H 2 O = 18.01 grams 1 mol NaCl = 58.44 grams1 mol SO 3 = ?? grams

12. How much does Avogadro exaggerate? He makes mountains out of molehills! Let’s Practice! How many grams are in 9.45 mol of dinitrogen trioxide? Known: # mol = 9.45 1 mol N 2 O 3 = 76.0 g 9.45 mol N 2 O 3 1 mol N 2 O 3 76.0 grams = 718.2 grams N 2 O 3

13. Try these! 1.Find the mass, in grams, of 3.32 mol K 2.Find the mass, in grams, of 2.5 mol Fe(OH) 2 3.How many grams are in 1.5 mol CO 2 ? 4.How many moles are in 92.2 g of Fe 2 O 3 ?