Homework Help: chem

Posted by tomi on Friday, September 26, 2008 at 10:02pm.

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 ?

Responses

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

what do u mean by change density to stp

chem - bobpursley, Friday, September 26, 2008 at 10:40pm
Density of gases changes with temp and pressure. Didn't I set that up for you?

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