Avogadro's Number- 6.02 x 10^23

• Atoms and molecules are extremely small
• Macroscopic objects contain too many to count or weight individually
• Amedeo Avogadro proposed that the only number of atoms in 12.00000g of Carbon be equal to a constant (= 1 mol of C)
• This value is now called Avogadro's number and forms the basis of all quantitative chemistry
• 1.0 mol= 6.02 x 10^22 atom
• 1 pair= 2
• 1 dozen= 12
• 1 century= 100
• 1 mol= 6.02 x 10^23
• One mole represents a huge number of particles

Particle

Atom- element- 6.02 x 10^23/1 mol

Molecule- covalent compound- 6.02 x 10^23/ 1 mol

Formula unit- ionic compound- 6.02 x 10^23/1 mol

Example: 2.47 x 10^25 atoms x 1 mol/ 6.02 x 10^23 atoms = 41 mol

http://www.youtube.com/watch?v=AsqEkF7hcII

By: Krysta Del Rosario :)