Avogadro's Law & Avogadro's Number

Avogadro's Law

Avogadro's law is a Gas Law which states that " Equal Volumes of Gases under the same Temperature and Pressure conditions will contain equal number of particles (atoms, ion, molecules, electrons, etc.) regardless of their Chemical nature and Physical properties " .

The law is named after an Italian Chemist Amedeo Avogadro who, in 1811, analysed that the two given samples of an ideal gas , of the same Volume and at the same Temperature and Pressure , contains the same number of molecules .

Mathematically the law can be stated as :-

V/n = k

where,

V is the volume of the gas,

n is the amount of substance of the gas &

k is a proportionality constant.

Avogadro's Number

Avogadro's number is one of the fundamental constants of Chemistry and a dimensionless quantity represented by N having a numerical value of 6.022 14 × 10 23 mol -1 .