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Byju's Answer
Standard IX
Chemistry
Mole Concept & Avogadro Number
What is avaga...
Question
What is Avogadro's number?
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Solution
Scientist:
Avogadro number was discovered by the Italian scientist Amedeo Avogadro.
The law was first proposed in
1811
.
Avogadro number:
One mole of a substance contains exactly
6
.
022
×
10
23
elementary entities.
The value of the Avogadro number is a fixed value and it is also called the Avogadro constant.
It is represented as symbol
(
N
A
)
and expressed in the unit
mol
-
1
.
The elementary entities may be an atom, a molecule, an ion, an electron, or any other particle.
For example:
1
mol
of hydrogen atoms
=
6
.
022
×
10
23
atoms,
1
mol
of water molecules
=
6
.
022
×
10
23
water molecules,
1
mol
of sodium chloride
=
6
.
022
×
10
23
molecular units of sodium chloride.
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