It is defined as the number of molecules present in 22.4 dm³ of gas ,
or gram-molecule weight of any substance at N. T. P.

i.e. NA = 6.023 ´ 1023

e.g.

1) 22.4 dm³ of H₂ gas at N.T.P. contains 6.023 ´ 10²³ H₂ molecules.

2) 1 gm molecule of N₂ (i.e. 28 gms of nitrogen) contains 6.023 ´ 10²³ nitrogen molecules.

Index

6.1 The Gaseous States Properties
6.2 Boyle's Law
6.3 Charle's Law
6.4 Pressure - Temperature Law
6.5 Gay Lussac's Law
6.6 Avogadro's Law
6.7 Graham's Law of Diffusion
6.8 General Gas Equation

Chapter 7