# Chemistry AS DF CI 1.3, 1.4, and 4.1

- 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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