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The Mole Mole And Molar Masses


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The Mole Mole And Molar Masses

  1. 1. Mole and Molar Mass
  2. 2. <ul><li>You should have completed the worksheet on Mole and Molar Mass. </li></ul><ul><li>You may check your answers by clicking on this document: (Answers to Mole and Molar Mass). </li></ul>
  3. 3. Summary <ul><li>A mole of any substance contains 6 X 10 23 particles. </li></ul><ul><li>6 X 10 23 is called the Avogadro’s constant or Avogadro’s number. </li></ul><ul><li>Molar mass refers to the mass of one mole of a substance. It has the same value as A r or M r . </li></ul>
  4. 4. Molar Mass <ul><li>2.Mass of one mole of atoms of the element particles e.g atoms, molecules or ions </li></ul><ul><li>6 x 10 23 atoms = 1 mole of atoms = _____ g /mol </li></ul>MOLAR MASS
  5. 5. Formulae to remember <ul><li>1. </li></ul><ul><li>(a) Number of moles = Number of particles </li></ul><ul><li>6 x 10 23 (Avogadro’s constant) </li></ul><ul><li>OR </li></ul><ul><li>(b) Number of moles x 6 x 10 23 = Number of particles </li></ul>
  6. 6. Formulae to Remember <ul><li>2. (a) Relationship between mole and molar mass </li></ul><ul><li>Number of moles of an element </li></ul><ul><li>= mass of element in grams </li></ul><ul><li>relative atomic mass of the element </li></ul>Moles = Mass A r
  7. 7. Formulae to Remember <ul><li>2 (b) Mass of one mole of substances </li></ul><ul><li>(covalent compounds) </li></ul><ul><li>= mass of substance in grams </li></ul><ul><li>relative molecular mass </li></ul><ul><li>(c) Mass of one mole of substance </li></ul><ul><li>(ionic compounds) </li></ul><ul><li>= mass of substances in grams </li></ul><ul><li>relative formula mass </li></ul>Moles = Mass M r