Relative masses of atoms and molecules

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Relative masses of atoms and molecules

  1. 1. Done By: Eric Seow
  2. 2. • Masses of particles are often numbers which are very small and inconvenient• Relative mass is used in practice by chemists
  3. 3. • Lightest atom is the hydrogen atom• One nitrogen atom is 14 times heavier than a hydrogen atom; nitrogen has a relative atomic mass of 14• One iron atom is 56 times heavier than a hydrogen atom; iron has a relative atomic mass of 56
  4. 4. • Molecules consist of atoms joined together• Relative molecular mass is the average mass fo one molecule of a substance when compared with 1/12 of the mass of one atom of carbon-12• Symbol is M1
  5. 5. • Is found by adding up the relative atomic masses of all the atoms in the forumla
  6. 6. • Can be calculated from the formula of a compound• Can be calculated from the relative atomic mass of the elements of the compound
  7. 7. • Knowing the mass of an element in a compound, the mass of the element in a sample of the compound can be calculated
  8. 8. • Some compounds contain water• Said to be hydrated• Have H20 in their formula• Formula is CuSO4.5H2O• The mass of water in a compound can then be calculated•

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