Avogadro constant

1. Chemistry Formulae Chemistry Formulae
& &
EquationsEquations

2. Mole Concept
Avogadro Number, N
A
Group 17

3. a) 1 dozen = 12 units
b) 1 pair = 2 units
Daily life – we used:
To delegate a big quantity:
Definition
Chemistry- mole concept:
Mole is a substance quantity that contain a
number of particles such as atom, ion, or
molecule that have equal number of atom in 12
gram of
12
C or 6.02 x 10
23
particles

4. Example:
1 mole carbon atoms = 6.02 x 10
23
carbon atoms
1 year = 12 months
1 kg = 1000 g
1 month = 30 days
1 km = 1000 m
1 dozen oxygen atoms = 12 oxygen atoms
1 mole oxygen atoms = 6.02 x 10
23
oxygen atoms
1 mole sodium atoms = 6.02 x 10
23
sodium atoms
Daily life
Chemistry

5. Avogadro’s Number/ Avogadro's Constant, N
A
1 Mole of Substance = 6.02 x 10
23
Particles
N
A
= 6.02 x 10
23
mol
-1

examples

6. Analogy:
Large Constant
1 mole = 6.02 x 10
23
representative particles of a substance
Substance
N
A
= 6.02 x 10
23
mole
-1
Particles

7. Amedeo Amedeo
AvogadroAvogadro
Avogadro's number has been experimentally determined to
be 6.02 x 10
23
molecules gram mole
-1
Avogadro's number, N
A
= 6.02 x 10
23
particles theorized by
Amadeo Avogadro later mathematically proven by Sanislao
Canizzaro around the 1750's.
N
A

8. Example 1:
Particles
Mole
RAM/ RMM
(g/mole)
Water, H
2
O NaOHSodium, Na
23.0
23+16+1
= 40
(2x1) + 16 = 18
11 1
6.02x10
23
mole
-1
molecules/
3 (6.02x10
23
mole
-1
atoms)
6.02 x 10
23
mole
-1
molecules
6.02 x 10
23
mole
-1
atoms

9. • 4 (1 g/mole) = 4 g/mole
• 4 mole
• 4 (6.02 x 10
23
particles)
• 1(4 g/mole) = 4 g/mole
• 1 mole
• 6.02 x 10
23
particles
Hydrogen (H)Helium (He)
Example 2:

10. . Define the definition of
Mole concept:Mole is a quantity that contain a number of particles
such as atom, ion, or molecule that have equal
number of atom in 12 gram of
12
C or 6.02 x 10
23

particles.
N
A
= 6.02 x 10
23
mol
-1

Avogadro Number:
Question

11. 2. If 1 mole of a substance contains 6.02 x 10
23
particles, than,
1 mole of Na contains
1 mole of Na
+
contains
1 mole of H
2
O contains6.02 x 10
23
water molecules
6.02 x 10
23
sodium ions
6.02 x 10
23
sodium atoms

12. 3. Calculate number of mole and a atomic number of each
substance given below and fill in the table with the correct
answers.



0.2
Helium
Aluminium
0.5 X 6.02 x 10
23
Carbon
2.0Potassium
6.02 X10
23
1.0Iron
Atomic NumberNumber of MoleSubstance
2.0 X 6.02 x10
23
0.5
1.5 1.5 X 6.02 x 10
23
0.2 X 6.02 x 10
23

13. . Define the definition of
Mole concept:Mole is a quantity that contain a number of particles
such as atom, ion, or molecule that have equal
number of atom in 12 gram of
12
C or 6.02 x 10
23

particles.
N
A
= 6.02 x 10
23
mol
-1

Avogadro Number:
Quiz

14. 2. Calculate number of mole, molecule number and atomic
number of each substance given below and fill in the table
with the correct answers.
Molecule
compound
Number of
Mole
Compound
Molecule
Number
Atomic Number
Water, H
2
O 1 6.02 x 10
23
2 X 6.02 x 10
23
atom
hydrogen
6.02 x 10
23
atom oxygen
Carbon
dioxide, CO
2
1 6.02 x 10
23
6.02 x 10
23
atom carbon

2 X 6.02 x 10
23
atom
oxygenAmmonia,
NH
3
0.5 0.5x6.02x10
23
0.5 X 6.02 x 10
23
atom
nitrogen
3 X 0.5 x 6.02 x 10
23

atom hydrogen
Hydrogen
chloride, HCl
3 3 x 6.02 x 10
23
3 X 6.02 x 10
23
atom
hydrogen
3 X 6.02 x 10
23
atom
chloride