Introduction to the mole, molar masses and Relative atomic masses

 THE MOLE

1.The mole is the SI unit of the amount of substance.

2.The number of particles e.g. atoms, ions, molecules, electrons, cows, cars are all measured in terms of moles.

 3.The number of particles in one mole is called the Avogadros Constant. It is denoted “L”.

The Avogadros Constant contain 6.023 x10 ²³ particles. i.e.

                   1mole = 6.023 x10 ²³ particles                              =  6.023 x10 ²³

                   2 moles =  2 x 6.023 x10 ²³ particles                    =  1.205 x10 ²⁴

                                0.2 moles =  0.2 x 6.023 x10 23 particles            =  1.205 x10 ²²    

                    0.0065 moles =  0.0065 x 6.023 x10 ²³ particles          =  3.914 x10 ²¹