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Today

Today. You will need a calculator! Go get it. Counting Atoms. What are some ways that we make it easier to count groups of things?. Atoms and molecules are tiny. Counting groups is a pain in the back.

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Today

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  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 1023 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. Oxygen O2 32.00 grams/mole

  9. Water H2O 18.02 grams/mole

  10. Calcium chloride CaCl2 110.98 grams/mole

  11. Sodium chloride NaCl 58.44 grams/mole

  12. Fluorine gas F2 38.00 grams/mole

  13. Sulfur S8 256.56 grams/mole

  14. Baking Soda NaHCO3 56.54 grams/mole

  15. Potassium permanganate KMnO4 158.04 grams/mole

  16. It seemed that...

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