The radius of a hydrogen atom is about 0.5 . Calculate its value in SI unit of length
and nm.
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Radius of hydrogen atom, r = 0.5 Å = 0.5 × 10-10 m
Volume of hydrogen atom = (4/3) π r3
= (4/3) × (22/7) × (0.5 × 10-10)3
= 0.524 × 10-30 m3
1 mole of hydrogen contains 6.023 × 1023 hydrogen atoms.
∴ Volume of 1 mole of hydrogen atom = 6.023 × 1023 × 0.524 × 10–30
= 3.16 × 10–7 m3
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