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Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles)of He(g) is present in a helium-oxygen mixture having a density of 0.538g/L at 25celsius and 721mmHg ?

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chemistry - bobpursley, Friday, September 26, 2008 at 8:26pm
change that density to stp.

what do u mean by change density to stp

  • chem - ,

    Density of gases changes with temp and pressure. Didn't I set that up for you?

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