1. Today You will need a calculator! Go get it

2. Counting Atoms

3. What are some ways that we make it easier to count groups of things?

4. Atoms and molecules are tiny... Counting groups is a pain in the back. 18 grams of water contain 602 000 000 000 000 000 000 000 molecules (more or less...) How can we make this easier?

5. 1 mole = 6.023 x 10 23 items

6. We still don’t want to count the things! The mass of one mole is the MOLAR MASS 1 mole of iron = 602 000 000 000 000 000 000 000 atoms = 55.85 grams

7. Posters around the room... Lists of Elements and Compounds, with their Molar Mass I did NOT give any hint as to how I found the molar mass. You know how to look up mass on the periodic table for each atom. You have 5 minutes to look at the posters and figure out what you would need to do.

8. OxygenO 2 32.00 grams/mole

9. WaterH 2 O 18.02 grams/mole

10. Calcium chloride CaCl 2 110.98 grams/mole

11. Sodium chloride NaCl 58.44 grams/mole

12. Fluorine gasF 2 38.00 grams/mole

13. SulfurS 8 256.56 grams/mole

14. Baking Soda NaHCO 3 56.54 grams/mole

15. Potassium permanganate KMnO 4 158.04 grams/mole

16. It seemed that...