Formulae, equations & amount of substance

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  • Created by: Shannon
  • Created on: 05-03-14 16:52
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  • Formulae, equations & amount of substance
    • Amount of substance
      • n=cxV
      • n=m/M
    • Molar volumes of gases
      • n=V/Vm
      • Vm = 24 dm3mol-1
      • Standard temperature and pressure are used to compare molar volumes.
        • 298 K
        • 1 atmosphere pressure
    • A mole
      • The amount of substance that contains the same number of stated elementary units as there are atoms in 12 g of carbon-12
        • This is also called the Avogadro constant
          • 6.022x1023 mol-1
    • Empirical formula
      • The simplest whole number ratio of the number of atoms of each element present in a compound
    • Percentage yield
      • Practically, achieving 100% yield is very rare
        • Some product is left behind on the apparatus
        • Volatile products may evaporate
        • Human error is weighing/decanting etc
      • mass of product/theoretical mass x100
    • Atom economy
      • The number of atoms that end up in the desired product
      • Mass of atoms in desired product/Maa of atoms in reactant x100
    • Molecular formula
      • The molecular formula provides the number of each atom that makes up a molecule
    • Defintions
      • Ions
        • An atom or molecule with a net electic charge to the loss or gain of electrons
      • Atom
        • An atom consists of neutrons & protons in a nucleus and electrons orbiting the nucleus
      • Element
        • An element consists of one type of atom - they are defined by the number of protons they possess


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