1. TOPIC: Counting Atoms – The Mole Do Now: Please take out something to write with and your calculator and get ready for a QUIZ

2. Using Mass to Count Things Atoms are so tiny it is impossible to count # atoms in only 1 gram of matter mass So, chemists use mass to “ count ” atoms

3. The MOLE Is the unit used to “ count ” # atoms Defined: # atoms in 12.0 grams of C-12 –This is the STANDARD! 12.0 g of C-12 has 6.02 X 10 23 atoms 602,000,000,000,000,000,000,000 atoms

4. What is a mole? Not this kind of mole! Let’s check out a video

5. The MOLE 1 mole of any element has 6.02 X 10 23 particles This is a really big number – It ’ s so big because atoms are really small!

6. The number of particles or representative units represented in 1 mole of a substance is known as Avogadro’s Number. = 6.02 X 10 23 One mole of water = 6.02 X 10 23 water molecules One mole of gorillas is 6.02 X 10 23 gorillas One mole of He atoms is 6.02 X 10 23 He atoms One mole of anything is 6.02 X 10 23 of that thing

7. Similar Words PairPair: 1 pair of shoelaces = 2 shoelaces DozenDozen: 1 dozen oranges = 12 oranges GrossGross: 1 gross of spider rings = 144 rings ReamReam: 1 ream of paper = 500 sheets paper MoleMole: 1 mole of Na atoms = 6.02 X 10 23 Na atoms

9. 1 mole is equal to the Formula Mass of each element

10. What is the mass of 1 mole of Mg (magnesium)? 1 mole of Mg = 24 grams

11. 1 mole is always equal to 6.02 x 10 23

12. So, how many atoms are in 1 mole of Mg? 1 mole of Mg = 24 grams = 6.02 x 10 23

13. MOLAR mass for any element: molar mass of any element = atomic mass in g/mole 1 mole Ne = 20 g/mol [= 6.02 X 10 23 atoms] 1 mole Ar = 40 g/mol [= 6.02 X 10 23 atoms] 1 mole Kr = 84 g/mol [= 6.02 X 10 23 atoms]

14. Equalities 1 mole of C-12 = 12.0 grams of C-12 = 6.02 X 10 23 atoms of C-12 1 mole of N-14 = 14.0 grams of N-14 = 6.02 X 10 23 atoms of N-14

15. Equalities 1 mole of C-12 = 12.0 grams of C-12 = 6.02 X 10 23 atoms of C-12 0.5 mole of C-12 = 6.0 grams of C-12 = 3.01 X 10 23 atoms of C-12

16. Equalities 1 mole C-12 = 12.0 g C-12 = 6.02 x 10 23 atoms C-12 0.25 mole of C-12 = 3.0 grams of C-12 = 1.50 X 10 23 atoms of C-12

17. What is the Molar Mass of CuSO 4 (hint, it’s just like Formula Mass, just a different unit) Cu = 1 x 64 = 64 S = 1 x 32 = 32 O= 4 x 16 = 64 ________ 160 g/mol

18. Now Lets Take the QUIZ Let’s check out a video