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1.27 The Mole

 1.27 What is a mole?

A mole of rice grains would form a huge mountain of rice with enough rice to feed the world's current population for the next 6088978 years!

 Students should:

1.27 know that the mole (mol) is the unit for the amount of a substance

1.28 understand how to carry out calculations involving amount of substance, relative atomic mass (Ar) and relative formula mass (Mr)

A mole (mol) is the quantity of anything that has the same number of particles as there are atoms found in 12.0 grams of carbon-12.  

This number of particles is a very large number : 6 x 1023  

One mole of atoms of an element is the amount of that element equal to the relative atomic mass in g

In other words - one mole of oxygen atoms has a mass of 16g, one mole of Lithium atoms has a mass of 6.9g etc.

Thus there are the same number of atoms in 16g of oxygen as there are atoms in 6.9g  Lithium and of course 12g  of Carbon.

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