1. Unit 4
The Mole

2. The Mole – a unit of counting, equal to 6 x 1023 particles.
It is based on the number of carbon atoms in 12 grams of carbon
6 x 1023 atoms of carbon

3. Avogadro’s Number – the number of objects in a mole
1 mole = 6 x 1023 particles

4. C 12 amu 12 g 6 Carbon Mass of 1 atom Mass of 1 mole of atoms
Molar Mass – the mass of one mole of any substance 6 C
Carbon
12.01
Mass of 1 atom
Atomic Mass
Mass in amu
6 protons +
6 neutrons
12 amu
Mass of 1 mole of atoms
Molar Mass
Mass in grams
1 mole of Carbon weighs 12 grams
12 g

5. Molar Volume – the volume of one mole of any gas at standard temperature and pressure (STP)

6. Scientific Notation – used to express very big or very small numbers.
Coefficient: Always a number between 1.0 and 9.9
The base number is always 10
The exponent equals the number of places that you moved the decimal point
13,000,000 meters
1.3
x 10 7