1 / 43

The Mole Unit

Learn about the mole unit, Avogadro's number, representative particles, converting moles to particles and vice versa, calculating molar mass, and finding percent composition.

cblackmon
Download Presentation

The Mole Unit

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. The Mole Unit No, not that mole!

  2. Essential Question: What is a Mole?

  3. What are some common things to count? Pair = 2 Dozen = 12 Baker’s dozen= 13

  4. So, how do we count particles? We use a Mole!

  5. What is a Mole? A unit of measurement used to count the number of particles in a chemical substance. One Mole = Avogadro’s number

  6. What is Avogadro’s number? 6.02 x 1023representative particles

  7. What are the 3 representative particles? -Atoms (elements from P.T.) -Molecules (Covalent, 2 or more non-metals) -Formula Units (Ionic, metal + non metal)

  8. Let’s practice

  9. Mole Map 1 Mole = 6.02 x 1023representative particles 1 Mole 6.02x1023 -atoms -molecules -Formula units

  10. How do you calculate the number of particles in a Mole?

  11. Example #1 How many atoms are in 2 moles of helium?

  12. Example #2 How many molecules are in 7.5 moles of water?

  13. How do you calculate the number of moles when given the number of particles?

  14. Example #3 A sample of lead contains 1.5 x 1024 atoms. How many moles of lead atoms are there?

  15. Example #4 A sample of iron chloride contains 2.15 x 1021 formula units. How many moles of iron chloride are there?

  16. Essential Question: How do you find the mass of a mole?

  17. What does the mass on the periodic table represent? One mole of particles in grams

  18. What is the name for this value called? Molar mass

  19. 1 Mole= 6.02 x 1023representative particles 1 Mole = Molar Mass from Periodic Table 1 Mole 6.02x1023 -Atoms -Molecules -Formula Units Mass from P.T. (in grams)

  20. How do you convert the number of moles to mass of an element?

  21. Example #5 What is the mass of 0.25 moles of chromium?

  22. Example #6 A container has 6.44 moles of carbon, what is the mass of this carbon?

  23. How do you convert the mass of an element to moles?

  24. Example #7 If a sample of aluminum has a mass 81 g, how many moles are present?

  25. Example #8 How many moles are there in 256g of Mercury?

  26. How do you find the mass of a compound? • Count the number atoms for each element • Multiply each atom’s mass by the number of atoms for that element. • Add

  27. What are the units for molar mass? g/mol

  28. Example #9 What is the molar mass of lithium nitrate, LiNO3?

  29. Example #10 What is the molar mass of calcium acetate, Ca(C2H3O2)2?

  30. How do you convert from the mass of a compound to moles?

  31. Example #11 How many moles are present in 12.78g of CO2?

  32. How do you convert from moles to mass of a compound?

  33. Example #12 Convert 0.57 moles of H2O to grams.

  34. Multiple step conversions Remember the mole is the base unit!!!!

  35. 1 Mole= 6.02 x 1023representative particles 1 Mole = Molar Mass from Periodic Table 1 Mole 6.02x1023 Representative particles Mass from P.T. (in grams)

  36. Example #13 How many molecules of ammonia, NH3 are in a 68g sample?

  37. Example #14 Convert 9.82 x 1027 formula units of KCl to grams.

  38. Percent Composition

  39. What is Percent Composition? This is the percentage by mass of each element in a compound

  40. How do you find the percent composition for an element in a compound? • Calculate the Molar Mass of the compound

  41. Example #15 CaCl2

  42. Example #16 H2SO4

  43. On your own! NaHCO3

More Related