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Homework Help Forum: chemistry
Posted by tomi on Friday, September 26, 2008 at 8:17pm.
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.
density1=P2T2/(P1*T1 density2)
Then
at stp, using decimalpercents,
densityHe*percentHe+densityO2*percentO2 =denstiygasSTP
Those percents will be by mass. To change to percent by moles, divide each percent by mass by atomic mass of He, and O2, and normalize to 100.
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- chemistry - tomi, Friday, September 26, 2008 at 9:22pm
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wat do u mean by change density to stp
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