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Mastering the Mole: Final Exam Review on Units and Molar Calculations

Prepare for your chemistry final with this comprehensive review of counting units like pairs, dozens, and moles. Learn about Avogadro's number (6.02 x 10²³), and how to convert between moles and mass using examples involving aluminum oxide (Al₂O₃). Solve problems such as determining how many atoms are in a given number of moles or calculating masses from moles. Ideal for students looking to strengthen their understanding of chemical quantities and molar mass concepts. Don't forget to complete the assigned homework for practice!

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Mastering the Mole: Final Exam Review on Units and Molar Calculations

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  1. The Mole Final Exam Review

  2. Counting units: pair dozen gross ream mole

  3. Counting units: pair 2 dozen gross ream mole

  4. Counting units: pair 2 dozen 12 gross ream mole

  5. Counting units: pair 2 dozen 12 gross 144 ream mole

  6. Counting units: pair 2 dozen 12 gross 144 ream 500 mole

  7. Counting units: pair 2 dozen 12 gross 144 ream 500 mole 602213670000000000000000

  8. Counting units: pair 2 dozen 12 gross 144 ream 500 mole 6.02 x 1023

  9. The mole 1 mole = 6.02 x 1023

  10. The mole The mole, also called Avogadro's number, is the SI unit for the amount of a substance.

  11. The mole How many roses in 3.5 dozen?

  12. The mole How many roses in 3.5 dozen? 12 roses 3.5 doz x ----------------- = doz

  13. The mole How many roses in 3.5 dozen? 12 roses 3.5 doz x ----------------- = 42 roses doz

  14. The mole How many atoms in 3.5 moles?

  15. The mole How many atoms in 3.5 moles? 6.02 x 1023 atoms 3.5 mol x ------------------------- = mol

  16. The mole How many atoms in 3.5 moles? 6.02 x 1023 atoms 3.5 mol x ------------------------- = mol 21.1 x 1023 atoms

  17. The mole How many atoms in 3.5 moles? 6.02 x 1023 atoms 3.5 mol x ------------------------- = mol 2.11 x 1024 atoms

  18. The mole How many moles are 4.5 x 1024 atoms? 1 mol 4.5 1024 x ----------------------- = 6.02 x 1023

  19. The mole How many moles are 4.5 x 1024 atoms? 1 mol 4.5 1024 x ----------------------- = 6.02 x 1023 7.48 mol

  20. Molar Mass of Compounds What is the mass of 1 mole of Al2O3?

  21. Molar Mass of Compounds What is the mass of 1 mole of Al2O3? 2 moles Al 3 moles O

  22. Molar Mass of Compounds What is the mass of 1 mole of Al2O3? 2 moles Al x 27.0 g/mole 3 moles O x 16.0 g/mole

  23. Molar Mass of Compounds What is the mass of 1 mole of Al2O3? 2 moles Al x 27.0 g/mole = 54.0 g 3 moles O x 16.0 g/mole = 48.0 g

  24. Molar Mass of Compounds What is the mass of 1 mole of Al2O3? 2 moles Al x 27.0 g/mole = 54.0 g 3 moles O x 16.0 g/mole = 48.0 g ------- 102.0 g

  25. Molar Mass of Compounds What is the mass of 1 mole of Al2O3? 2 moles Al x 27.0 g/mole = 54.0 g 3 moles O x 16.0 g/mole = 48.0 g ------- 102 g

  26. Converting Moles to Mass What is the mass of 1.25 moles Al2O3?

  27. Converting Moles to Mass What is the mass of 1.25 moles Al2O3? 2.50 moles Al 3.75 moles O

  28. Converting Moles to Mass What is the mass of 1.25 moles Al2O3? 2.50 moles Al x 27.0 g/mole 3.75 moles O x 16.0 g/mole

  29. Converting Moles to Mass What is the mass of 1.25 moles Al2O3? 2.50 moles Al x 27.0 g/mole = 67.5 g 3.75 moles O x 16.0 g/mole = 60.0 g

  30. Converting Moles to Mass What is the mass of 1.25 moles Al2O3? 2.50 moles Al x 27.0 g/mole = 67.5 g 3.75 moles O x 16.0 g/mole = 60.0 g ---------- 127.5 g

  31. Converting Moles to Mass What is the mass of 1.25 moles Al2O3? 2.50 moles Al x 27.0 g/mole = 67.5 g 3.75 moles O x 16.0 g/mole = 60.0 g ---------- 127 g

  32. Tonight’s Homework: Pp 311-312, problems 1-4

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