Chemistry Chemistry
Formulae & Formulae &
EquationsEquations
Mole Concept Avogadro Number, NA
Group 17
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 12C or 6.02 x 1023 particles
Example:
1 mole carbon atoms = 6.02 x 1023 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 1023 oxygen atoms
1 mole sodium atoms = 6.02 x 1023 sodium atoms
Daily life
Chemistry
Avogadro’s Number/ Avogadro's Constant, NA
1 Mole of Substance = 6.02 x 1023 Particles
NA = 6.02 x 1023 mol-1
examples
Analogy:
Large Constant
1 mole = 6.02 x 1023 representative particles of a substance
Substance
NA = 6.02 x 10 23 mole-1 Particles
Amedeo Amedeo AvogadroAvogadro
Avogadro's number has been experimentally determined to
be 6.02 x 1023 molecules gram mole-1
Avogadro's number, NA= 6.02 x 1023 particles theorized by
Amadeo Avogadro later mathematically proven by Sanislao
Canizzaro around the 1750's.
NA
Example 1:
Sodium, Na NaOH Water, H2O
RAM/ RMM (g/mole)
Mole
Particles
23.0 23+16+1 = 40
(2x1) + 16 = 18
11 1
6.02x1023mole-1molecules/
3 (6.02x1023 mole-1 atoms)
6.02 x 1023
mole-1molecules
6.02 x 1023
mole-1 atoms
Helium (He) Hydrogen (H)
• 1(4 g/mole) = 4 g/mole• 1 mole• 6.02 x 1023 particles
• 4 (1 g/mole) = 4 g/mole• 4 mole• 4 (6.02 x 1023 particles)
Example 2:
1. 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.
NA = 6.02 x 1023 mol-1
Avogadro Number:
Question
2. If 1 mole of a substance contains 6.02 x 1023 particles, than,
1 mole of Na contains
1 mole of Na+ contains
1 mole of H2O contains 6.02 x 1023 water molecules
6.02 x 1023 sodium ions
6.02 x 1023 sodium atoms
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
Carbon 0.5 X 6.02 x 1023
Helium
Aluminium 0.2
2.0 X 6.02 x1023
0.5
1.5 1.5 X 6.02 x 1023
0.2 X 6.02 x 1023
1. 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.
NA = 6.02 x 1023 mol-1
Avogadro Number:
Quiz
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, H2O 1 6.02 x 1023 2 X 6.02 x 1023 atom hydrogen 6.02 x 1023 atom oxygen
Carbon dioxide, CO2
1 6.02 x 1023 6.02 x 1023 atom carbon 2 X 6.02 x 1023 atom oxygenAmmonia,
NH3
0.5 0.5x6.02x1023 0.5 X 6.02 x 1023 atom nitrogen3 X 0.5 x 6.02 x 1023 atom hydrogen
Hydrogen chloride, HCl
3 3 x 6.02 x 1023 3 X 6.02 x 1023 atom hydrogen 3 X 6.02 x 1023 atom chloride