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Radius of hydrogen atom = 0.5
= 0.5 x 10-10 m (Size here refers to Diameter!)
Volume occupied by the hydrogen atom=
=
=
1 mole of hydrogen contains 6.023 x 1023 hydrogen atoms.
Volume of 1 mole of hydrogen atom = 6.023 x 1023 x 0.524 x 10-30
= 3.16 x 10-7 m3
The molar volume is
times greater than the atomic volume.
Hence, intermolecular separation in gas is much larger than the size of a molecule.