Quantitative Chemistry

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  • Created by: Abc312
  • Created on: 14-05-18 19:53
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  • Quantative Chemistry
    • Relative Formula Mass (Mr)
      • The sum of all the atomic masses of the atoms in a formula
    • The law of conservation of mass
      • States that no atoms are lost or made during a reaction
      • The mass of reactants equals the mass of the products
    • If the mass changes during a reaction it is usually due to a gas
      • If a gas is a product then it is not usually measured in the first place
      • If a products a gas then it usually escapes so is not measured
    • Moles
      • A mole of a substance in grams is the same as the formula mass
      • A mole is 6.02 x 10^23
        • This is the number of atoms, molecules or ions in a substance.
        • Called the Avogadro constant
    • Limiting Reactants
      • In a reaction with two reactants there is usually one in excess
        • This is done to make sure that all of the other reactant has reacted
      • The reactant that is completely used is called the limiting factor because it is the thing that limits the amount of products
    • Concentration
      • The concentration can be found by
        • Concentration
          • =
            • Moles
              • ÷
                • Volume
        • This gives it in mol/dm3
          • Use mass = Mr x moles to get it in grams
    • Volumes of gases
      • The volume of one mole at room temperature and pressure is 24dm3
        • At 20C and 1 atmosphere
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