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The unit of length convenient on the atomic scale is known as an angstrom and is denoted by Å ∶ 1Å = 10−10 The size of a hydrogen atom is about 0.5Å, what is the total atomic volume in m3 of a mole of hydrogen atoms?

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Radius of hydrogen atom, r = 0.5 = 0.5 × 10–10 m

Volume of hydrogen atom = (4/3)πr3 

1 mole of hydrogen contains 6.023 × 1023 hydrogen atoms.

Volume of 1 mole of hydrogen atoms = 6.023 × 1023 × 0.524 × 10–30 

= 3.16 x 10-7 m3 

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