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Gas volumes

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Cookaburra | 14:59 Wed 24th Sep 2008 | Science
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Why does 1 mole of Helium occupy the same volume as 1 mole of say Radon despite the fact that Helium is a much smaller atom.
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Avatar Image sandmaster
It is almsot 50 years since I took O level Physics and I have no clue - but will the following help?
www.antonine-education.co.uk/Physics_AS/Module_2/Topic_8/topic_8.htm

Scroll down until you find a definitiion for mole.
16:42 Wed 24th Sep 2008
Avatar Image Teddio
The clue is in the conditions. One mole of any gas at a pressure of 101kPa and 273K will occupy a volume of approximately 22.4 cubic decimetres.
At the same temperature of 273K the lighter He atoms will be moving much faster than the heavier Ra atoms but both atoms will have the same translational kinetic energy (given by KE = 3/2kT, where k is the Boltzmann Constant.
22:10 Wed 24th Sep 2008

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