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- @AtGraphic 130,100
- @Picture AEC10_03.bmp
- @At 135,15
- Atoms are far too small to measure individually so chemists
- have developed a method of using large numbers of them
- that can be measured.
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- The Mole.
- @PlaySoundFile AEC10_01.wav
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- @Prompt
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- @At 135,150
- A Mole is a fixed number of particles of a particular substance.
- @PlaySoundFile AEC0_02.wav
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- @Prompt
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- @At 135,250
- The number used is a very large number called AvagadroÆs
- number.
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- AvagadroÆs number = 6.023 x 1023
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- This is the number of atoms in one gramme of Hydrogen.
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- This gives us the formula:
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- Number of Moles = Mass in g
- RAM
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- for iron 56g = 1Mole
- 56
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- and for sulphur 32g = 1Mole
- 32
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- The equation for the reaction of iron and sulphur is
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- Fe + S -> FeS
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- Each iron atom reacts with a single sulphur atom.
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- Therefore 1 mole of iron will react with 1 mole of sulphur.
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- This is called the mole ratio.
- Fe + S -> FeS
- 1 mole 1 mole 1mole
- 56g 32g 88g
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- This means that if you know the mass of one reactant and the
- mole ratio you can calculate the mass of the other reactant
- and products in a reaction.
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