6.1 The mole

 

A mole tells about particles, a substance that contains the same amount number of units of carbon atoms in 12g of carbon 12

The number representing the mole is the Avogadro constant, which is

 

6 x 10^23

 

So one mole is an Avogadro constant, which unit is

g/ml or Mole

 

For example, Sodium is made of single sodium atoms, it's Ar is 23

so it contains 1 mole of sodium atoms

 

If iodine is made of iodine molecules, its Mr is 254,

so it conains 6 x 10^23 iodine molecules, 

or one mole of iodine molecules

 

 

 

 

 

 

 

Some Calculations can be found by using the mole 

by remembering this triangle

 

 

 

    mass

 

           

 

     Ar/Mr x no of moles

 

 

 

 

 

Mass

the mass can be found by multiplying

the mass of one mole, which is the Ar or Mr,

by the number of moles

mass is also in grams

 

 

 

Ar / Mr

The mass of one mole can be found by dividing the mass(g) by number of moles

 

 

 

The number of moles

the number can be found by diving the mass(g)

by the Ar/Mr

 

 

 

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