Explain Avogadro Law with figure.

1.	Explain Avogadro Law with figure.
Answer» Solution :In 1811, Avogadro proposed that equal volumes of gases at the same temperature and PRESSURE should contain equal NUMBER of molecules. Avogadro made a distinction between atoms and molecules which is quite understandable in the present times. If we consider again the reaction of hydrogen and oxygen to produce water, we see that two volumes of hydrogen combine with one volume of oxygen to give two volumes of water without LEAVING any unreacted oxygen. Note thatin the figure below each box contains equal number of molecules. In fact, Avogadro could explain the above result by considering the molecules to be polyatomic. If hydrogen and oxygen were CONSIDERED as diatomic. Dalton and others believed at that time that atom of the same kind cannot combine and molecules of oxygen or hydrogencontaining two atoms did not exist.

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