“Good News & Bad News About Chemistry, Plus Counting Without Counting”

• http://www.chemistryland.com/CHM130W/07-Mole/Mole.htm

The MoleThe Mole - a unit used to count small

particles such as atoms

• Important Facts: The standard for the mole is the number of atoms in 12 grams of Carbon-12

• This number is 6.023 x1023 and is known as Avogadro’s number

Avogadro

Avogadro’s Number…Give him a call(How to lose a date in 3 seconds)

1 Mole is 602,300,000,000,000,000,000,000of something

Units For Counting

Dozen =

Ream =

How Many…1. A dozen eggs is _____ eggs.

2. A dozen elephants is _____ elephants.

3. A dozen cars is _____ cars.

4. A dozen flying monkeys is _____ flying monkeys

How Many…1. A mole of eggs is _____ eggs.

2. A mole of elephants is _____ elephants.

3. A mole of cars is _____ cars.

4. A mole of flying monkeys is _____ flying monkeys

5. A mole of atoms is _______ atoms.

6. A mole of molecules is ________ molecules.

7. A mole of dollar bills is ________ dollar bills.

8. A mole of particles is ________ particles.

9. A mole of anything is ___________.

The number is the same but is the mass?

• Is the mass of a dozen eggs the same as the mass of a dozen elephants?

• Is mass of a mole of carbon atoms the same as the mass of a mole of hydrogen atoms?

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Useful Conversions Factors

1 mole = 6.022 x 1023 particles

1 mole = gfm (molar mass)

1 mole = 22.4 Liters (@STP)