12 1 How Many Atoms

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12 1 How Many Atoms

  1. 1. Launch: 12/1   Grab your binder and immediately take a seat!   Place homework (practice questions), binder paper, and a pen/pencil on your desk. Today’s Objective: I can convert between moles and atoms using Avogadro’s number as a conversion factor Tonight’s HW: Finish the back of the practice question worksheet
  2. 2. Launch 12/1 4.  How many grams of NH3 are there in 2 moles of NH3? a.  1.00 moles b.  14.01 grams c.  17.04 grams d.  34.08 grams
  3. 3. Launch 12/1 5.  How many moles of N2 are there in 14.01g of N2? a.  .5 moles b.  2 mole c.  14.01 moles d.  28.02 moles
  4. 4. Announcements   Quiz on Friday   The mole   Conversions   Unit exam in 2 weeks
  5. 5. How many atoms? Mr. Heffner 12/1/09
  6. 6. Review: How many moles?   Molar mass   used to convert between grams and moles   units = grams/mole   can be shown as a fraction Molar mass of H2 = 2.02 g/mol 2.02 grams 1 mole or 1 mole 2.02 grams
  7. 7. How many atoms?   Avogadro’s number… ..or particles, or molecules   is equal to 6.02 X 1023 atoms/mol   can be used to convert between moles and atoms 6.02 X 1023 atoms 1 mole or 1 mole 6.02 X 1023 atoms ..or particles, or molecules
  8. 8. How many atoms?   There is a 3-step process for conversions: 1.  Write down the starting unit. 2.  Write the conversion factor with the starting units on the bottom. 3.  Cancel like terms and multiply across the top and bottom.
  9. 9. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #1: Write down the starting unit. 2 moles
  10. 10. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #2: Write conversion factor with the starting units on the bottom. 6.02 X 1023 atoms 2 moles X = 1 mole
  11. 11. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #3: Cancel like terms and multiply across the top and bottom. Ignore 6.02 X 1023 atoms 2 X 6.02 X 1023 atoms 2 moles X = 1 mole 1 +1 = 12.04 X 1023 atoms = 1.204 X 1024 atoms
  12. 12. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #1: Write down the starting unit. 1.5 moles
  13. 13. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #2: Write conversion factor with the starting units on the bottom. 6.02 X 1023 atoms 1.5 moles X = 1 mole
  14. 14. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #3: Cancel like terms and multiply across the top and bottom. Ignore 6.02 X 1023 atoms 1.5 X 6.02 X 1023 atoms 1.5 moles X = 1 mole 1 = 9.03 X 1023 atoms
  15. 15. Example #3 How many moles are there in 3.01 X 1023 molecules of CO2?   Step #1: Write down the starting unit. 3.01X1023 molecules
  16. 16. Example #3 How many molecules are there in 1.5 moles of CO2?   Step #2: Write conversion factor with the starting units on the bottom. 1 mol 3.01X1023 molecules X = 6.02X1023 molecules
  17. 17. Example #3 How many molecules are there in 1.5 moles of CO2?   Step #3: Cancel like terms and multiply across the top and bottom. 1 mol 3.01 X 1 mol 3.01X1023 molecules X = 6.02X10 23 molecules 6.02 = .5 mol
  18. 18. Whiteboards   Work in pairs   Trade-off marker every question   You have 60 seconds to solve the question   Show all of your work!   Don’t forget units!   Lift board only when prompted
  19. 19. How many atoms are there in 1 mole of potassium (K)?
  20. 20. How many molecules are there in .5 moles of HCl?
  21. 21. How many moles of NO are there in 9.03 X 1023 particles?
  22. 22. How many moles of fluorine (F) are there in 12.04 X 1023 atoms?
  23. 23. Practice Questions   Practice question worksheet
  24. 24. Exit Slip 1.  What is Avogadro’s number? a.  6.02 X 1024 atoms b.  6.02 X 1023 atoms c.  3.01 X 1023 atoms d.  1.2 X 1024 atoms
  25. 25. Exit Slip 2.  Which of the following shows the correct way to calculate the number of atoms in 2 moles of O2? 32.00 grams a.  16 moles X 1 mole 1 mole b.  2 moles X 16.00 grams 1 atoms c.  2 moles X 6.02 X 1023 moles 6.02 X 1023 atoms d.  2 moles X 1 mole
  26. 26. Exit Slip 3.  How many atoms of sodium (Na) are in 1 mole? a.  3.01 X 1023 atoms b.  6.02 X 1023 atoms c.  12.04 X 1023 atoms d.  1.204 X 1024 atoms
  27. 27. Exit Slip 4.  How many molecules of C3OH are in .5 moles? a.  3.01 X 1023 molecules b.  6.02 X 1023 molecules c.  9.03 X 1023 molecules d.  1.204 X 1024 atoms
  28. 28. Exit Slip 5.  If there are 1.204 X 1024 particles of gold (Au), how many moles are there? a.  .5 moles b.  1 mole c.  2 moles d.  4 moles
  29. 29. Homework   Finish practice questions

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