A level Chem HELP Watch

catlol
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I have never understood how to determine an element from its density in g-cm-3 at RTP. For example an element has a density of 1.33x10-3g cm-3. Someone please explain how you would arrive to the answer (oxygen). Thanks.
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ChemistryWebsite
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If you are considering a gaseous element, you can work out the mass of 1 mole if you know the density at rtp.

The volume of 1 mole of any gas at rtp is 24dm3 (or 24000cm3). You have the mass of 1cm3 so calculate the mass for 1 mole.
Once you know the mass of a mole you should be able to work out which element.
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