Chemistry AS DF CI 1.3, 1.4, and 4.1

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  • Created by: A.B.
  • Created on: 30-11-13 09:54
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  • DF Calculations from Equations CI 1.3, 1.4 and 4.1
    • Co-efficient tells you number of moles.
    • Working out masses
      • To  work out mass of one mole, add up the Ar of the atoms in the compound.
      • To calculate reacting masses, use triangle formula - including ratio (1:1 is the same as 2:2)
    • Working out volumes of gasses
      • The volume of 1 mole of gaseous substance is 24dm   at 25  and 1 atm.
      • To calculate reacting masses, use triangle.
    • Working out both mass and volume.
      • Use both triangles.
    • Working with enthalpy changes
      • The enthalpy change of combustion tells you the amount of energy released when 1 mole of a fuel is burnt completely under standard conditions.
      • Use percentages/ common sense.

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