Avogadro’s Law – Gas Law Chemistry Notes

Avogadro’s Law:

Avogadro, in 1813, gave this law. It relates the volume and number of particles of ideal gases at constant temperature and pressure. It states

“Equal volumes of all gases at the same temperature and pressure contain the same number of molecules.”

It means if two gases have the same volume, same temperature and same pressure then their number of molecules will also be the same. Mathematically law can be written as  :

                     V         ∝        n

Or                    V         =          Kn      

On the bases of this law, Avogadro pointed that

22.4 dm³ of any gas at STP contains 6.02 x 10²³ molecules.

Or 24 dm³ of any gas at RTP contains 6.02 x 10²³ molecules.

Or in other words

   Volume of 6.02 x 10²³ molecules of any gas at STP = 22.4 dm³  

Or    

    Volume of 6.02 x 10²³ molecules of any gas at RTP = 24 dm³

Also read !!

Boyle’s Law

Charle’sLaw

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