question_answer 18)

One mole of an ideal gas at S.T.P. occupies 22.4 L. What is the ratio of molar volume to the atomic volume of a mole of hydrogen ? Why is this ratio so large ? Take the radius of hydrogen molecule to be 1 A.  

Answer:

Radius of a hydrogen molecule   Atomic volume of a mole of hydrogen = Avogadro's no.  Volume of a hydrogen molecule   Molar volume     This ratio is large because the actual size of the gas molecules is negligibly small in comparison with the intermolecular separation.