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TOPIC: Counting Atoms – The Mole

TOPIC: Counting Atoms – The Mole Do Now: Please take out something to write with and your calculator and get ready for a QUIZ. Using Mass to Count Things. Atoms are so tiny it is impossible to count # atoms in only 1 gram of matter So, chemists use mass to “ count ” atoms. The MOLE.

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TOPIC: Counting Atoms – The Mole

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  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 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 1023 atoms 602,000,000,000,000,000,000,000 atoms

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

  5. The MOLE • 1 mole of any element has 6.02 X 1023 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 1023 • One mole of water = 6.02 X 1023 water molecules • One mole of gorillas is 6.02 X 1023 gorillas • One mole of He atoms is 6.02 X 1023 He atoms • One mole of anything is 6.02 X 1023 of that thing

  7. Similar Words • Pair: 1 pair of shoelaces = 2 shoelaces • Dozen: 1 dozen oranges = 12 oranges • Gross: 1 gross of spider rings = 144 rings • Ream: 1 ream of paper = 500 sheets paper • Mole: 1 mole of Na atoms = 6.02 X 1023 Na atoms

  8. 1 mole is equal to the Formula Mass of each element

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

  10. 1 mole is always equal to 6.02 x 1023

  11. So, how many atoms are in 1 mole of Mg? 1 mole of Mg = 24 grams = 6.02 x 1023

  12. MOLAR mass for any element: molar mass of any element = atomic mass in g/mole 1 mole Ne = 20 g/mol [= 6.02 X 1023 atoms] 1 mole Ar = 40 g/mol [= 6.02 X 1023 atoms] 1 mole Kr = 84 g/mol [= 6.02 X 1023 atoms]

  13. Equalities 1 mole of N-14 = 14.0 grams of N-14 = 6.02 X 1023 atoms of N-14 1 mole of C-12 = 12.0 grams of C-12 = 6.02 X 1023 atoms of C-12

  14. Equalities 0.5 mole of C-12 = 6.0 grams of C-12 = 3.01 X 1023 atoms of C-12 1 mole of C-12 = 12.0 grams of C-12 = 6.02 X 1023 atoms of C-12

  15. 0.25 mole of C-12 = 3.0 grams of C-12 = 1.50 X 1023 atoms of C-12 Equalities 1 mole C-12 = 12.0 g C-12 = 6.02 x 1023 atoms C-12

  16. What is the Molar Mass of CuSO4(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

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

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