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Mole Concept
Avogadro Number, NA
Group 17
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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, ormolecule that have equal number of atom in 12
gram of 12C or 6.02 x 1023particles
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Avogadros Number/ Avogadro's Constant,NA
1 Mole of Substance = 6.02 x 1023
Particles
NA= 6.02 x 1023 mol-1
examples
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Analogy:
Large Constant
1 mole = 6.02 x 1023representative particles of a substance
Substance
NA= 6.02 x 1023mole-1 Particles
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Amedeo
Avogadro
Avogadro's number has been experimentally determined to
be 6.02 x 1023molecules gram mole-1
Avogadro's number, NA= 6.02 x 1023particles theorized by
Amadeo Avogadro later mathematically proven by Sanislao
Canizzaro around the 1750's.
NA
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Example 1:
Sodium, Na NaOH Water, H2
O
RAM/ RMM(g/mole)
Mole
Particles
23.023+16+1
= 40(2x1) + 16 = 18
11 1
6.02x1023mole-1molecules/
3 (6.02x1023mole-1atoms)
6.02 x 1023
mole-1molecules
6.02 x 1023
mole-1atoms
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Helium (He) Hydrogen (H)
1(4 g/mole) = 4 g/mole
1 mole6.02 x 1023particles
4 (1 g/mole) = 4 g/mole
4 mole4 (6.02 x 1023particles)
Example 2:
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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 equalnumber of atom in 12 gram of 12C or 6.02 x 1023
particles.
NA= 6.02 x 1023mol-1
Avogadro Number:
Question
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2. If 1 mole of a substance contains 6.02 x 1023particles, than,
1 mole of Na contains
1 mole of Na+ contains
1 mole of H2O contains 6.02 x 1023water molecules
6.02 x 1023sodium ions
6.02 x 1023
sodium atoms
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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
Aluminium0.2
2.0 X 6.02 x1023
0.5
1.5 1.5 X 6.02 x 1023
0.2 X 6.02 x 1023
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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 equalnumber of atom in 12 gram of 12C or 6.02 x 1023
particles.
NA= 6.02 x 1023mol-1
Avogadro Number:
Quiz
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