1 / 13

Unit 5: The Mole

Unit 5: The Mole. Molar Mass. The sum of the atomic masses of all the atoms in the formula of a compound or molecule. Calculating Molar Mass. Calculate the molar mass for H 2 O: H = 2 x 1.0079 g = 2.0158 g O = 1 x 15.999 g = 15.999 g Molar mass of water = 18.0148 g

pascale-prince
Download Presentation

Unit 5: The Mole

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. Unit 5: The Mole

  2. Molar Mass • The sum of the atomic masses of all the atoms in the formula of a compound or molecule

  3. Calculating Molar Mass • Calculate the molar mass for H2O: • H = 2 x 1.0079 g = 2.0158 g • O = 1 x 15.999 g = 15.999 g Molar mass of water = 18.0148 g • Calculate the molar mass for Fe2(SO4)3: • Fe = 2 x 58.847 g = 117.694 g • S = 3 x 32.06 g = 96.18 g • O = 12 x 15.999 g = 191.988 g Molar mass of iron (III) sulfate = 405.862 g

  4. Practice Practice Practice!!!

  5. The Mole • A counting word, just like a dozen • A dozen = 12 • A mole = 6.02 x 1023 • Two moles of marbles = 2 x 6.02 x 1023 • Three moles of hair pins = 3 x 6.02 x 1023 • 6.02 x1023 also known as Avogadro’s # • Amedeo Avogadro (Italian Scientist) aided in this development

  6. Mole Conversion Factor Molar mass (g) of substance = 6.02 x 1023 molecules of substance = 1 mole of substance

  7. Mole Conversion Factor Possibilities • 1 mole molar mass (g) • molar mass (g) 1 mole • 1 mole 6.02 x 1023 atoms or molecules • 6.02 x 1023 atoms or molecules 1 mole

  8. Mole Conversion Factor Possibilities • molar mass (g) 6.02 x 1023 atoms or molecules • 6.02 x 1023 atoms or molecules molar mass (g) • Use the word atoms when describing a single element; use the word molecule when describing molecules and compounds

  9. Mole Conversion Examples Molar mass = Avogadro’s # = 1 mole 18.0148 g of H2O = 6.02 x 1023 molecules of H2O = 1 mole of H2O 405.862 g of Fe2(SO4)3 = 6.02 x 1023 of Fe2(SO4)3 = 1 mole of Fe2(SO4)3 6.941 g of Li = 6.023 x 1023 atoms of Li = 1 mole of Li

  10. Mole Conversion Practice Problem 1 • If 5,000,000 chlorine atoms are used to disinfect water, how many moles is that? 5,000,000 atoms Cl x 1 mole Cl = 8.3 x 1023 mole Cl 6.02 x 1023 atoms Cl 8.3 x 1023 mole Cl  8 x 1023 mole Cl Correct Sig Fig

  11. Mole Conversion Practice Problem 2 • Thirty moles of carbon monoxide could be a lethal amount. How many grams is that? 30 moles CO x 28.01 g of CO = 840.3 g of CO 1 mole CO 840.3 g CO  800 g CO Correct Sig Fig

  12. Mole Conversion Practice Problem 3 • One liter of water weighs 1,000 g. How many water molecules is that? 1,000 g H2O x 1 mole H2O x 6.02 x 1023 molecules H2O = 3.3 x 1023 molecules H2O 18.0148 g H2O 1 mole H2O 3.3 x 1023molecules H2O  3 x 1023 molecules H2O Correct Sig Fig

  13. Practice Practice Practice!!!

More Related