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- 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. 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. 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. Announcements Quiz on Friday The mole Conversions Unit exam in 2 weeks
- 5. How many atoms? Mr. Heffner 12/1/09
- 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. 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. 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. Example #1 How many atoms are there in 2 moles of carbon (C)? Step #1: Write down the starting unit. 2 moles
- 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. 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. Example #2 How many atoms are there in 1.5 moles of CO2? Step #1: Write down the starting unit. 1.5 moles
- 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. 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. 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. 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. 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. 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. How many atoms are there in 1 mole of potassium (K)?
- 20. How many molecules are there in .5 moles of HCl?
- 21. How many moles of NO are there in 9.03 X 1023 particles?
- 22. How many moles of fluorine (F) are there in 12.04 X 1023 atoms?
- 23. Practice Questions Practice question worksheet
- 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. 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. 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. 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. 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. Homework Finish practice questions

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