Mole (Chemist secret unit)
A mole is defined as the amount(mass) of a substance that contains 6.02 x 1023 number of particles (atoms, molecules or formula units). OR mole is the atomic mass, molecular mass or formula mass of a substance expressed in grams is called mole. It establishes a link between mass of a substance and number of particles. It is abbreviated as ‘mol’.
Avogadro’s Number: Avogadro’s number is the number of particles ( atoms, ions or molecules) in one mole of a substance. OR 6.022 χ 1023 number of atoms, molecules or formula units is called avogadro’s number. It is symbolized by NA and has a value of
6.022 χ 1023.
- one mole of carbon =12 gram= 6.02 x 1023 atoms of carbon = 1NA.
- one mole of water= 18gram= 6.02 x 1023 molecules of H2O= 1NA.
- one mole of sodium chloride= 58.5gram= 6.02 x 1023 formula units of NaCl = 1NA.
(1776-1856) was an Italian scholar. He is famous for molecular theory commonly known as Avogadro’s law. In tribute to him, the number of particles (atoms, molecules, ions) in mole of a substance 6.02 x 1023is known as the Avogadro’s constant.