Avogadro's Number

• atoms and molecules are extremely small
• macroscopic objects contains too many to count or weigh individually
• Amedo Avogrado proposed that the number of atoms is 12.00000 g of carbon be equal to a constant. ( This is equal to 1 mol of carbon)
• This value is now called Avogadro's number and forms the basis of all quantitive chemistry.
• Avogadro's number 6.02x 10^23
• 1 mol = 6.02x10^23
• One mole is simply refer to 1 multiple of things
• One mole represents a huge number of particles

 

 

 EX.

a sample of carbon contains 2.47x10^25. How many carbon is this?

2.47x10^25 x 1 mol/6.02x10^23 atoms = 41.0 mol

0.57 mol x 6.02x10^23 FU/1mol = 3.43x10^23