Asked by tomi
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 ?
Answers
Answered by
bobpursley
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.
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.
Answered by
tomi
wat do u mean by change density to stp
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