1 / 119

Introduction to the Mole and Molar Mass

Introduction to the Mole and Molar Mass. Revised 9/05/10. Purpose. At the completion of this unit students will Have a conceptual understanding of the mole as the method of “counting” items and finding the mass of items that can’t be seen.

mavis
Download Presentation

Introduction to the Mole and Molar Mass

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to the Mole and Molar Mass Revised 9/05/10

  2. Purpose At the completion of this unit students will • Have a conceptual understanding of the mole as the method of “counting” items and finding the mass of items that can’t be seen. • Be able to calculate the number of items (molecules, atoms, ions, and formula units) if given the number of moles. • Be able to calculate the number of moles if given the number of items. • Be able to calculate the mass of a sample if given the number of moles in a sample. • Be able to calculate the number of moles in a sample if given the mass of a sample. • Be able to prepare a sample containing a given number of moles. • Be able to determine the molar mass of a compound.

  3. Background • When you buy eggs you usually ask for a _______ eggs. • You know that one dozen of any item is ______. Dozen 12

  4. Paper • Paper is packaged by a ream. • A ream of paper has 500 sheets. • Why is it useful to use units like a dozen or a ream?

  5. What determines how many items should make up a particular unit?

  6. If you were asked to design a new unit to count something, what would you consider when choosing how many items should be included in your new counting unit?

  7. Materials • 3 packages of different types of candy, balance, worksheet, calculator, pencil.

  8. Part 1 • Record the number of items in each package. • Measure the mass of each package. Record the mass of each package in the data table. • Answer questions in Analysis and Interpretations. • Record masses your group measured on the board summarizing class data.

  9. Data Table 1 26.9 4 4 23.03 20.96 4

  10. ANALYSIS AND INTERPRETATION • As you know, a dozen represents 12 items. • Since I did not have enough items to make a dozen, I decided to make a new counting unit. I called this unit an DART. Each of your packages contains _____ items. 4

  11. 1. A DART of oranges will have _____ oranges. 4

  12. 2. A DART of pretzels has ____ pretzels. 4

  13. 3. A DART of molecules of water has ____ molecules of water. 4

  14. 4. A DART of particles has ___ particles. 4

  15. 5. A DART of atoms of iron has _____ atoms of iron. 4 26 Fe 55.85

  16. 6. A DART of formula units of salt has _______ formula units of salt. 4

  17. 7. How many Hershey’s Kisses are in 2 DARTS? _______ 8

  18. 8. How many caramels are in 10 DARTS? _______ 40

  19. 9. How many Dum Dum Pops are in 400 DARTS? _______ 1600

  20. 10. How many Starbursts are in 1/2 DART? _____ 2

  21. 11. Write the directions for finding the number of items if given the number of DARTS

  22. 12. How many oranges are in 5 DARTS? _______ 20

  23. 13. How many apples are in 0.5 DARTS? _______ 2

  24. 14. How many pencils are in 0.25 (1/4) DARTS? ___ 1

  25. 15. How many atoms of silver are in 20 DARTS? _______ 80 47 Ag 107.9

  26. 16. How many molecules of water are in 5 DARTS? _______ 20

  27. 4 17. How many DARTS are 16 Hershey’s Kisses? ______

  28. 25 18. How many DARTS are 100 pretzels? ____

  29. 100 19. How many DARTS are 400 Starbursts? ____

  30. ¼ 0.25 20. How many DARTS is 1 orange? ________ (Write a fraction or a decimal.)

  31. 0.5 21. How many DARTS are 2 caramels? _____

  32. 22. Write your own directions for finding the number of DARTS given the number of pieces

  33. 23. How many DARTS are 48 Hershey’s Kisses? ____ 12

  34. 24. How many DARTS are 32 Hershey’s Kisses? ______ 8

  35. 25. How many DARTS are 24 Jolly Ranchers? ______ 6

  36. 26. How many DARTS are 2 Gobstoppers? ______ .5

  37. 27. How many DARTS are 20 caramels? ______ 5

  38. DARTS • DART of molecules of water would be too small to see. • Scientists had to select a bigger unit for counting molecules of substances. • The unit scientists use is called a MOLE.

  39. One MOLE of anything has 602,200,000,000,000,000,000,000items.

  40. AVOGADRO’S NUMBER • 6.022 x 1023 • One MOLE of anything has 6.022 x 1023 items.

  41. 28. How many Hershey’s Kisses make up 1 MOLE? 6.022 x 1023

  42. 29. How many caramels make up 10 MOLES? 10 [6.022 x 1023] 6.022 x 1024

  43. 30. Find the number of Jolly Ranchers in 4 MOLES. 4 [6.022 x 1023] 2.41 x 1024

  44. 31. Find the number of atoms of sodium in 2 MOLES. 2[6.022 x 1023 ] 1.20 x 1024 11Na 22.99

  45. 32. Find the number of molecules of water in 6 MOLES. 6[6.022 x 1023] 3.61 x 1024

  46. 33. Find the number of caramels in 0.5 MOLES. .5[6.022 x 1023 ] 3.011 x 1023

  47. 34. How many moles of caramels is 6.022x1023 of caramels? ___ 1

  48. 35. How many moles of Starbursts is 6.022x1023 of Starbursts? ___ 1

  49. 36. How many moles of Gobstoppers is 1.204x1024of Gobstoppers? ___ 2 1.204 x 1024 = 2 6.022 x 1023

  50. 37. How many atoms of potassium make up one MOLE? 6.022 x 1023 19 K 39.10

More Related