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Back in his days, Avogadro had a lot of free time, so he sat at his desk and calculated a unique number which he named after himself, the Avogadro’s number which is 6.022 x 10 23. This number is significant for a reason, it is what 1 mole means.

1. A mole is a quantity that contains 6.02.10 23 atoms, molecules and ions. Avogadro’s number is the number of particles in a mole 6.02.10 23. The mole (or mol) represents a certain number of objects. The amount of a substance that contains the same number of entities as there are atoms in 12 g of carbon-12.
2. Stoichiometry,mole concept, Avogadro's number, molar mass Online Chemistry tutorial IIT, CBSE Chemistry, ICSE Chemistry, engineering and medical chemistry entrance exams, Chemistry Viva, Chemistry Job interviews.
3. Learn the basics about Avogadro's Number, as a part of chemical calculations.Avogadro’s Number or the Avogadro Constant is 6.02 X 1023 Mol-1.

Notes on Mole Concept includes three basic terms like mole, molar mass and Avogadro’s Number.

What is 1Mole?

1 mole is an amount of a substance which contains as many particles as there are in 12 g of C-12 isotopes that is 6.022X10²³

6.022X10²³ is known as Avogadro’s number.It is important part of mole concept.

Mole= Mass of a substance/Molar Mass

Molar Mass is the mass of 1 mole of a substance in grams.

For example: 1 mole atoms = gram atomic mass = 6.022X10²³ atoms

Avogadro's Number Moles To Atoms

1 mole oxygen atoms = gram atomic mass of oxygen =16 g = 6.022X10²³ atoms

1 mole molecules = gram molecular mass = 6.022X10²³ molecules

Avogadro's Number Example

Example –

1 mole oxygen molecules = gram molecular mass of oxygen =32 g =

6.022X10²³ oxygen molecules

1 mole ions = formula unit mass = 6.022X10²³ ions

Example – 1 mole( SO₄)^2- ions = formula unit mass of ( SO₄)^2-=96g = 6.022X10²³

( SO₄)²ions

The mass (nucleon) number, A, is the sum of the protons and the neutrons. (= 12 for Carbon)

The atomic (proton) number, Z, of an element is the number of protons in the nucleus of the atom. In the neutral atom it is equal to the number of electrons. ( 6 for Carbon)

Avogadro's Number And Mole Concept Book

The Relative Atomic Mass, A(r), is the mass of one atom of an element compared to a scale in which one atom of carbon-12 has a mass of 12.0000.

The Relative Molecular Mass, M(r),is the ratio of the mass of one molecule of a substance to the mass of one atom of carbon-12. It is calculated by adding the relative atomic masses of all the atoms of all elements in the molecule.

Avogadro's Number And Mole Concept Worksheet

Relative molecular mass, M(r), or relative formula mass (for those compounds that do not exist as molecules) is calculated by adding together the Relative Atomic MassA(r) ‘s of the elements in the molecular formula.

Define Mole And Avogadro's Number

Read Moles Formula