79601979 3 2 a avogadro constant

8/12/2019 79601979 3 2 a Avogadro Constant

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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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79601979 3 2 a avogadro constant

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