Question

Avagadro’s law finds an application in the determination of :

(A) Atomicity of gas.

(B) Molecular weights of gases

(C) Molecular formula of certain gaseous compounds

(D) All of the above

Answer 1

Hint: It helps in determining atomicity of gas, molecular masses, understanding Gay-Lussac’s law etc.

Complete Step-by-step Solution:

Before determining the application of Avagadro’s law, let us find out what the law actually is.

Avagadro’s law: It states that “Under identical conditions of temperature, pressure and other physical factors , equal volume of all gases occupy equal number of molecules.”

The field of application of this law:

Atomicity: It refers to the total number of atoms in a molecule. Noble gases exist freely , do not form molecules hence their atomicity is one.

Molecular mass of the gases: It helps in determining the molecular mass of gases and establishes the relation between molecular mass and vapour density. Since it helps in determining the atomicity and molecular weights , it might be useful in determining the formula of certain compounds .

Hence, the correct option is D 

Note: One thing to note here is that the Avagadro’s number was calculated from this hypothesis only.