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New page in journal 1/16/13 10.1 The Mole Add to TOC On your 3x5 Card name above top line

New page in journal 1/16/13 10.1 The Mole Add to TOC On your 3x5 Card name above top line number the next 6 lines 1 through 6. How many is a pair? How many is a dozen? How many is a score? How many is a gross? How much is a bushel? How many is a ream?. pair = 2 dozen = 12

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New page in journal 1/16/13 10.1 The Mole Add to TOC On your 3x5 Card name above top line

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  1. New page in journal • 1/16/13 10.1 The Mole • Add to TOC • On your 3x5 Card • name above top line • number the next 6 lines 1 through 6

  2. How many is a pair? • How many is a dozen? • How many is a score? • How many is a gross? • How much is a bushel? • How many is a ream?

  3. pair = 2 • dozen = 12 • score = 20 • gross = 144 (12 dozen) • bushel = 4 pecks or 8 gallons (dry volume) • ream = 500

  4. The Mole But not this kind

  5. Open to back of book – Periodic Table • One atom of hydrogen has an atomic mass of 1.00794 • 1.00794 amu (atomic mass unit) • Oxygen?

  6. So, a molecule of H2O has a formula mass of 18.00988 amu • 18.0099 due to significant figures • H: 2 x 1.00794 2.01588 amu • O: 1 x 15.9994 15.9994_amu 18.00988 amu

  7. In science, a mole is a unit of measurement • we use it like pair and dozen • symbol (abbreviation): mol

  8. A mole stands for 6.02 x 1023 particles of a substance • we call this Avogadro’s number • based on the number of atoms in 12.0 grams of carbon-12 • in chemistry, 6.02 x 1023atoms • Example: 1 mole of iron equals 6.02 x 1023 atoms of iron

  9. Why do chemists use moles? • Moles make it easier to measure and count small particles • Does a dozen eggs have a different mass than a dozen grapefruit? • Yes! • Does a mole of carbon have a different mass than a mole of silicon? • Yes

  10. The atomic mass of an element is its molar mass • How many grams in 1 mole of hydrogen? • 1.0079 grams

  11. How many grams in 1 mole of NaCl • Na = 22.990 grams per mole • Cl = 35.453 grams per mole • 22.990 g + 35.453 g = 58.443 grams of NaCl per mole of NaCl

  12. How do you convert between grams and moles? • Dimensional Analysis

  13. You have 55.0 grams of CO2 • How many moles of CO2 do you have?

  14. First you need your conversion factor • How many grams of CO2 are in 1 mole of CO2 • C = 12.011 grams per mole • O = 15.999 grams per mole • and we need 2 of these • 12.011 g + (2 x 15.999 g) = 44.009 g/mol

  15. Balancing Equations WS #1 due today • WS #2 due before weekend • Your 5 Balancing Equations problems due before weekend • Mole-Mass Conversions Worksheet #1 due Wednesday of next week • we will spend lots of time in class working these problems

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