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What is Mole Concept?

Amedeo Avogadro found that one gram atom of any element contains the same number of atoms and one gram molecule of any substance contains the same number of molecules which is equal to 6.022 x 10 23 .

This number is called Avogadro 's number or constant and the amount of the substance containing 6.022 x 10 23 atoms or molecules is called a mole . Mole is the counting unit in chemistry as it is used to express large number of atoms or molecules

for example, 1 mole of oxygen means 6.022 x 10 23 molecules of oxygen. 1 mole of any substance can be defined as Amount of a substance that contains as many particles (atoms, molecules or ions) as there are atoms in 12 g of the 12 C isotope.

Molar mass of a substance can be defined as the mass of one mole of a substance in grams and it is numerically equal to atomic/molecular/formula mass in u.

 

 

or

 

 

 

 

One mole is defined as No entities of the substance, where No is equal to Avogadro’s number. The number is generally taken as 6.022 X 1023. Moles measure quantity of substance.

Mole Concept:

As group of 12 of anything is called one dozen, similarly, 6.022 x 1023 number of entities is called one mole. The entities may be atoms, molecules or any other particles.

Mole is also called Avogadro constant which is denoted by NA.

As per definition- One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of the C-12 isotope.

Learn the mole concept table

Mole Relationship

1 Mole

6.022 x 1023

22.4 L at STP

Gram Atomic Mass-GAM

Gram Molecular Mass-GMM

Categories

No of moles

No of particles

Volume

Mass

mass

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View Full Answer

Amedeo Avogadro found that one gram atom of any element contains the same number of atoms and one gram molecule of any substance contains the same number of molecules which is equal to 6.022 x 10 23 .

This number is called Avogadro's number or constant and the amount of the substance containing 6.022 x 10 23 atoms or molecules is called a mole . Mole is the counting unit in chemistry as it is used to express large number of atoms or molecules

for example, 1 mole of oxygen means 6.022 x 10 23 molecules of oxygen. 1 mole of any substance can be defined as Amount of a substance that contains as many particles (atoms, molecules or ions) as there are atoms in 12 g of the 12 C isotope.

Molar mass of a substance can be defined as the mass of one mole of a substance in grams and it is numerically equal to atomic/molecular/formula mass in u.

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The Mole Concept:

One mole of a substance (atoms, molecules, ions, or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams. One mole of any substance contains 6.022 �1023 particles (atoms, molecules, or ions). This means that one mole atom of any substance contains 6.022 �023 atoms. Similarly, one mole molecule of any substance contains 6.022 �023molecules, and one mole ion of any substance contains 6.022 �023 ions. Hence, the mass of a particular substance is fixed.

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Mole may be defined as the amount of substance that contains as many specified elementary particles as the number of atoms in 12 g of carbon 12 isotopes.The elementary particles may be atoms, molecules , electrons or ions etc.

1 mole = 6.023 × 1023. particles

1 mole of oxygen atom =6.023 × 1023. oxygen atoms.

1 mole of oxygen molecule =6.023 × 1023. oxygen molecule.

In case of ions mole concept is as follows:-

NaCl :- 1 mole of sodium chloride = 6.023 × 1023 NaCl unit

= 6.023 × 1023 Na+ ions + 6.023 × 1023 Cl- ions

Similarly in the CaCl2 :-

1 mole of CaCl2 = 6.023 × 1023 CaCl 2 unit.

= 6.023 × 1023 Ca2+ ions + 2× 6.023 × 1023 Cl- ions.

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One mole is defined as No entities of the substance, where No is equal to Avogadro’s number. The number is generally taken as 6.022 X 1023. Moles measure quantity of substance.

Mole Concept:

As group of 12 of anything is called one dozen, similarly, 6.022 × 1023 number of entities is called one mole. The entities may be atoms, molecules or any other particles.

Mole is also called Avogadro constant which is denoted by NA.

As per definition- One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of the C-12 isotope.

Learn the mole concept table

Mole Relationship

1 Mole

6.022 × 1023

22.4 L at STP

Gram Atomic Mass-GAM

Gram Molecular Mass-GMM

Categories

No of moles

No of particles

Volume

Mass

mass

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The mole is a unit of measurement for the amount of substance. Moles give us a consistent method to convert between atoms/molecules and grams.
The mathematical expression for calculating moles is expressed as:

We can express moles in terms of molecular mass, number of atoms/molecules and in terms of volume.
� 1 mole of a pure substance has a mass in grams equal to its molecular mass.
  • 1 mole contains the same number of particles as there are in 12g of carbon-12 atoms. This number is called Avogadro’s number and is equal to 6.023 �1023 particles.
  • 1 mole of a gas occupies a volume of: 22.4 litres at S.T.P.

Hope this helps

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An interesting fact about atoms and molecules is that they are very small in size but their numbers in even a small amount of any substance is very large. To handle these large numbers a unit of similar magnitude is required. Just as we denote dozen for 12 items and score for 20 items, we use mole for microscopic entities. 1 mole can be defined as “the amount of substance that contains as many specified elementary particles as the number of atoms in 12 grams of carbon-12 isotope.”
 
Now, mass of a carbon-12 atom = 1.99 �10-23 g
 
 
Hence, 1 mole = 6.022 �1023 atoms
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