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
    
                                                    There are no AI answers yet. The ability to request AI answers is coming soon!
                                            
                Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.