The document defines the mole concept as a quantity of particles that contains an equal number of atoms as 12 grams of carbon-12 (6.02 x 1023 particles). It also defines Avogadro's number (NA) as 6.02 x 1023 particles per mole. Examples are given of calculating the number of particles in 1 mole of various substances like sodium (Na), sodium hydroxide (NaOH), and water (H2O). The document concludes with practice problems defining the mole concept and calculating moles, molecules, and atoms for different substances.

1. Chemistry Formulae
&
Equations

2. Group 17
Mole Concept Avogadro Number, NA

3. To delegate a big quantity:
Daily life – we used:
a) 1 dozen = 12 units b) 1 pair = 2 units
Chemistry- mole concept:
Definition 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 12C or 6.02 x 1023 particles

4. Example:
Daily life 1 year = 12 months
1 month = 30 days
1 kg = 1000 g
1 km = 1000 m
Chemistry
1 dozen oxygen atoms = 12 oxygen atoms
1 mole oxygen atoms = 6.02 x 1023 oxygen atoms
1 mole sodium atoms = 6.02 x 1023 sodium atoms
1 mole carbon atoms = 6.02 x 1023 carbon atoms

5. 1 Mole of Substance = 6.02 x 1023 Particles
Avogadro’s Number/ Avogadro's Constant, NA
NA = 6.02 x 1023 mol-1
examples

6. 1 mole = 6.02 x 1023 representative particles of a substance
Large Constant
Analogy: Substance
NA = 6.02 x 10 23 mole-1 Particles

7. Amedeo NA
Avogadro
Avogadro's number, NA= 6.02 x 1023 particles theorized by
Amadeo Avogadro later mathematically proven by Sanislao
Canizzaro around the 1750's.
Avogadro's number has been experimentally determined to
be 6.02 x 1023 molecules gram mole-1

8. Example 1:
Sodium, Na NaOH Water, H2O
RAM/ RMM
(g/mole) 23.0 23+16+1 (2x1) + 16 = 18
= 40
Mole 1 1 1
6.02 x 1023 6.02 x 1023 6.02x1023mole-1molecules/
Particles mole-1 atoms mole-1molecules 3 (6.02x1023 mole-1 atoms)

9. Example 2:
Helium (He) Hydrogen (H)
• 1(4 g/mole) = 4 g/mole • 4 (1 g/mole) = 4 g/mole
• 1 mole • 4 mole
• 6.02 x 1023 particles • 4 (6.02 x 1023 particles)

10. Question
. 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 12C or 6.02 x 1023
particles.
Avogadro Number:
NA = 6.02 x 1023 mol-1

11. 2. If 1 mole of a substance contains 6.02 x 1023 particles, than,
1 mole of Na contains 6.02 x 1023 sodium atoms
1 mole of Na+ contains 6.02 x 1023 sodium ions
1 mole of H2O contains 6.02 x 1023 water molecules

12. 3. Calculate number of mole and a atomic number of each
substance given below and fill in the table with the correct
answers.
Substance Number of Mole Atomic Number
Iron 1.0 6.02 X1023
Potassium 2.0 2.0 X 6.02 x1023
Carbon 0.5 0.5 X 6.02 x 1023
Helium 1.5 1.5 X 6.02 x 1023
Aluminium 0.2 X 6.02 x 1023
0.2

13. Quiz
. 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 12C or 6.02 x 1023
particles.
Avogadro Number:
NA = 6.02 x 1023 mol-1

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 Number of Molecule Atomic Number
compound Mole Number
Compound
Water, H2O 1 6.02 x 1023 2 X 6.02 x 1023 atom
hydrogen
6.02 x 1023 atom oxygen
Carbon 1 6.02 x 1023 6.02 x 1023 atom carbon
dioxide, CO2
2 X 6.02 x 1023 atom
Ammonia, 0.5 0.5x6.02x1023 oxygen x 1023 atom
0.5 X 6.02
NH3 nitrogen
3 X 0.5 x 6.02 x 1023
atom hydrogen
Hydrogen 3 3 x 6.02 x 1023 3 X 6.02 x 1023 atom
chloride, HCl hydrogen
3 X 6.02 x 1023 atom
chloride