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2. Answer the following questions.

A. State and explain Avogadro's law.
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In 1811, Avogadro proposed that equal volumes of all gases at the same temperature and pressure contain equal number of molecules

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According to Avogadro law, if 1 volume contains n molecules, then 2n molecules of hydrogen combine with n molecules of oxygen to give 2n molecules of water .

Therefore, 2 molecules of hydrogen gas combine with 1 molecule of oxygen to give 2 molecules of water vapour. Avogadro could explain the above result by considering the molecules to be polyatomic. If hydrogen and oxygen were considered as diatomic, as recognized now, then the above results are easily understandable.

 

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