1. Avogadro’s number and the Mole
6,022,100,000,000,000,000,000,000 uses for a mole

2. What is a Mole? A Mole is a burrowing rodent
A mole is a blemish on the skin - sometimes dangerous!
A Mole is a VERY large number of atoms or molecules

3. } Nucleons Atomic mass Proton Neutron Electron Hydrogen Helium Carbon

5. How many atoms?
There are as many atoms in 1gram of hydrogen as there are in 12grams of carbon (graphite) or 56grams of iron.
The actual number of atoms is known as Avogadro’s number
A mole is a substance’s atomic or molecular mass - weighed out in grams!

6. Avagodro’s Number
This is the actual number of atoms or molecules in a mole:-
is far too difficult to write
x 1023 is the same number expressed in scientific notation.
Avogadro

7. Molarity
A 1 molar solution contains 1 mole of the substance in 1 Litre of solution.
E.G. NaOH has a molecular mass of 40;
a 40 gram/Litre solution of NaOH would be a 1 Molar solution

8. Molarity x Volume (in litres)
The number of moles in a certain amount of a solution is:
Molarity x Volume (in litres)
e.g mls of a 0.2 molar solution will contain moles

9. EXTENSION: What is the molarity of water?
Oxygen has an atomic mass of 16, and hydrogen has a mass of 1.
Water is H2O
Thus a molecule of water has a mass of 18, and as there are 1,000 g of water in a litre, water has a molarity of 1,000 ÷18 = M