Question

How Avogadro's hypothesis used to deduce atomicity of elementary gases? ​

Answer 1

Avogadro hypothesis states that equal volume of all gases under similar conditions of temperature and pressure contain equal number of molecules.

One of the applications of Avogadro’s law is to calculate atomicity of elementary gases. It is defined as the number of atoms of the elements present in one molecule of the substance. For example oxygen molecule has two oxygen atoms. So, atomicity of O2 is 2.

Similarly, atomicity of sulphur (S8) is 8.