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A vessel is filled with a mixture of oxy...

A vessel is filled with a mixture of oxygen and nitrogen. At what ratio of partial pressures will the mass of gases be identical?

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`PV=nRT=(w)/(M)RT`
`P_(O_(2))V=(w_(O_(2)))/(32)xxRT`
`P_(N_(2))V=(w_(N_(2)))/(28)xxRT`
`:. " " (P_(O_(2)))/(P_(N_(2)))=(w_(O_(2)))/(32)xx(28)/(w_(N_(2)))=(28)/(32)" "(because w_(O_(2))=w_(N_(2)))`
`=(7)/(8)=7:8`
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