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Unit V: The Mole Concept

Unit V: The Mole Concept. V.3. Multiple Conversions between Moles, Mass, Volume and Number of Particles. THE MIGHTY MOLE DIAGRAM. THE MIGHTY MOLE DIAGRAM. grams. moles. molecules. atoms. L @STP. Mighty Mole Questions Grams to Molecules conversion.

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Unit V: The Mole Concept

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  1. Unit V: The Mole Concept V.3. Multiple Conversions between Moles, Mass, Volume and Number of Particles

  2. THE MIGHTY MOLE DIAGRAM

  3. THE MIGHTY MOLE DIAGRAM grams moles molecules atoms L @STP

  4. Mighty Mole QuestionsGrams to Molecules conversion • How many molecules are in a 2.62 g sample N2O4 • Plan: g  mol  molecules • 1.71 x 1022 molecules

  5. Mighty Mole QuestionsMolecules to Litres Conversion • Find the volume occupied by 1.204 x 1026 molecules of SO2 at STP? • Plan: molecules  moles  L • 4480 L

  6. Mighty Mole QuestionsGrams to Atoms Conversion • Find the total number of atoms in a 300.0 g glass of water. • Plan: g  mol  molecules  atoms date leaves • 3.01 x 1025 atoms

  7. Mighty Mole QuestionsGrams to Molecules • 0.0342 g CH4 = ? Molecules • Plan: grams  moles  molecules • 1.29 x 1021 molecules

  8. Mighty Mole QuestionsLitres to Molecules Conversion • 54.3 L of NO2 = ? Molecules • 1.46 x 1024 molecules

  9. Mighty Mole QuestionsMolecules to Grams Conversion • Find the mass of 3.68 x 1025 molecules of NO2 (g)? • 2.81 x 108 grams

  10. Mighty Mole QuestionsMolecules  Litres (STP) Conversion • 1.35 x 1026 molecules of NH3 = ? L at STP • 5.03 x 103 L

  11. Mighty Mole QuestionsGrams to Atoms Conversion • Find the number of atoms in a 286.0 g sample of C3H8? • 4.30 x 1025 atoms

  12. Mighty Mole Questions • Find the number of “O” atoms in a 60.0L sample of N2O4 • 6.45 x 1024 “O” atoms

  13. Hebden • Do Exercises 22 (a); 23 (a-d); 24 on pages 86-87 of Hebden • Do Exercises 36 (a); 37 (a) ; 38 (c); 42 (b, h, m) on pages 88-89 of Hebden • Assignment #9

  14. M D V DENSITY AND MOLES • Density is the mass per unit of volume

  15. THE MIGHTY MOLE DIAGRAM grams moles molecules atoms L @STP

  16. Density of Gases at STP Mass of 1 mole Volume 1 mole = Molar Mass 22.4 • Density STP = • DSTP = MM (g/mol) 22.4 (L/mol) FOR GASES ONLY

  17. Density of Gases at STP • Find the density of P2O5 gas at STP? • DSTP • 6.34g/L = MM (g/mol) 22.4 (L/mol)

  18. Density of Gases at STP • Calculate the density of O2 (g) at STP? • DSTP • 1.43 g/L = MM (g/mol) 22.4 (L/mol)

  19. Density of Gases at STP • The density of air is about 1.29 g/L. What is the density of Cl2 (g) at STP? • DSTP • 3.17 g/L  so Cl2 (g) is more dense than air = MM (g/mol) 22.4 (L/mol)

  20. Molar Mass From Density at STP • DSTP = MM (g/mol) 22.4 (L/mol) MM = DSTP x 22.4

  21. Molar Mass From Density at STP • An oxide of chlorine has a density of 3.013 g/L at STP • Find the molar mass of this gas • Determine the molecular formula for this gas MM = DSTP x 22.4

  22. Molar Mass From Density at STP • An oxide of chlorine has a density of 3.013 g/L at STP • 6.75 g/mol MM = DSTP x 22.4

  23. Molar Mass From Density at STP • ClO  • ClO2 • ClO3

  24. Molar Mass From Density at STP • A mystery gas has a density of 1.696 g/L at STP. It is an element. • Find it’s molar mass • 38.0 g/mol MM = DSTP x 22.4

  25. Molar Mass From Density at STP • Given the molar mass of 38.0 g/mol • Guess the gas

  26. M D V Density of Solids and Liquids WHAT TO DO WHEN YOU DON’T HAVE A GAS!! M = D x V

  27. M D V THE MEGA MIGHTY MOLE DIAGRAM D x V grams moles molecules atoms L @STP

  28. Example:Density  Molecules Conversion • The density of Boron (solid) is 2.34 g/mL. How many molecules are there in a 60.0 mL chunk of boron? • Plan: D x V  g  mol  molecules • 7.83 x 1024 molecules of Boron

  29. ExampleAtoms  Volume Conversion • Liquid mercury has a density of 13.55 g/mL. Find the volume occupied by 1.806 x 1027 atoms. (Hg is monatomic) • Plan: atoms  molecules mol g volume • 44413 mL or 44.4L

  30. ExampleMoles  Density Conversion • A 5.00 mL sample of solid lead is known to contain 0.274 moles of Pb. Calculate the density of Pb. • Plan: mol g density • 11.35 g/mL

  31. Example:Density  MM (STP) • 250.0 mL of a gas which is known to be a fluoride of sulphur has a mass of 1.63 g at STP • a) Find the molar mass • 146.0g/mol

  32. ExampleDensity  MM (STP) (b) What is the molecular formula for the gas. (Calculated Molar Mass = 146.0g/mol – fluoride of sulphur) SF6 = 146.1 g/mol

  33. ExampleD  MM (STP) • 1.25 L of disilane gas has a mass of 3.47 g. What is the molar mass? (Assume STP) • Plan: Density  MM • 62.2 g/mol

  34. Example Density  MM (STP) • It is found that a 0.0263 mole sample of gas occupies a volume of 482.0 mL. Calculate the molar volume in L/mol. • 18.33 L/ mol

  35. Hebden • Do Exercises 25, 27, 28 and 29 on pages 88 of Hebden • Do Exercises 40 (e), 41 (a, f, h, k), 42 (b, e, n) on pages 89 of Hebden • Do Hand-In Density Worksheet

  36. Mid-Unit Test • Mega Mighty Mole Diagram • Mole Conversions

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