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The Mole

The Mole. AS. What is the hidden message?. Learning Objectives. Understand the terms “amount of substance”, “mole” and “Avagadro’s constant” (N A ) Define and use the term “molar mass” with units g mol -1

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The Mole

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  1. The Mole AS

  2. What is the hidden message?

  3. Learning Objectives • Understand the terms “amount of substance”, “mole” and “Avagadro’s constant” (NA) • Define and use the term “molar mass” with units g mol-1 • Know the terms empirical formula, molecular formula and be able to claculate them using composition by mass and percentage compositions

  4. Some definitions • Amount of substance is the number of particles. • The mole is a measurement of how many particles there are • Avogadro’s number = 6.02x1023 • It tells us how many particles there are in one mole • So in one mole of Oxygen there are 6.02x1023 Oxygen atoms • In one mole of water there are 6.02x1023 water molecules

  5. To work out the number of moles • Number of moles = Number of particles • Number of particles in one mole So if you have 3.01 x1023 atoms of carbon how many moles do you have? How many moles do you have for each of these? 4.05 x1020 atoms of tungsten 1.2 x1024molecules of disulphur dichloride 3.75 x1023 atoms of Scandium 1.9 x10 23 molecules of pentane

  6. Molar Mass • Basically the same as relative atomic mass only with units of grams per mole (gmol-1) • Number of moles = Mass of chemical Molar mass

  7. Find the molar masses of the following compounds: • 1) NaBr • 2) PbSO4 • 3) Ca(OH)2 • 4) Na3PO4 • 5) (NH4)2CO3 • 6) C6H12O6 • 7) Fe3(PO4)2 • 8) (NH4)2S   • 9) Zn(C2H3O2)2 • 10) AgF

  8. Find the molar masses of the following compounds: • 1) NaBr • 2) PbSO4 • 3) Ca(OH)2 • 4) Na3PO4 • 5) (NH4)2CO3 • 6) C6H12O6 • 7) Fe3(PO4)2 • 8) (NH4)2S • 9) Zn(C2H3O2)2 • 10) AgF • 1) 102.9 g/mol • 2) 303.3 g/mol • 3) 74.1 g/mol • 4) 164.0 g/mol • 5) 96.0 g/mol • 6) 180.0 g/mol • 7) 357.4 g/mol • 8) 68.1 g/mol • 9) 183.4 g/mol • 10) 126.9 g/mol

  9. Empirical formula and molecular formula • The empirical formula is the smallest ratio of the atom (note it is always a whole number ratio) • The molecular formula is the actual make up of the molecule

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