Avogardo's Number : How we count atoms?
Tuesday, November 16, 2010 /1:59 PM
- Atoms and molecules are extremely small
- Macroscopic objects contains too many to count or weigh individually
- Amedeo Avogardo proposed that the number of atoms in 12.00000g of carbon be equal to a constant. (This is equal to 1 mol of carbon)
- this value is now called Avogardo's number and forms the basis of all quantitative chemistry
- So what is Avogardro's number?
Avogadro's numbers: 6,020,000,000,000,000,000,000,000 = 6.02 X 10
²³
- 1.0 mol = 6.02 X 10²³
- One mole is simply a multiple of things
- 1 pair =2
- 1 dozen = 12
- 1 century = 100
- 1 mol = 6.02 X 10²³
HOW BIG IS A MOLE?
- 1 mole of meters would cross the entire galaxy over 3000 times
- 1 mole of smarties would completely cover 250 planets the size of Earth in a km deep worth of smarties
- 1 mole of seconds is almost 100,000 times more than the age of the universe
- $mol would be enough to give every person on Earth 1 million billion dollars
- 1 mole of blood cells would be more than the total number of blood cells in every human on Earth
- one mole represents a huge number of particles
examples
- a sample of fluorine contains 3.57 X 10²⁵ atoms. How many moles of fluroine is this?
3.57 X 10²⁵ X 1 mol
6.02 X 10²³
= 5.930232558 mol
=5.930
CHLOE KO
