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The density of a mixture of O(2) and N(2...

The density of a mixture of `O_(2)` and `N_(2)` at NTP is 1.3 g/L. Calculate partial pressure of `O_(2)`.

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Mol. Wt. of the mixture = density (g/L) `xx` molar volume (L)
`= 1.3 xx 22.4 = 29.12`
Noe let the no. of moles of `O_(2)` and `N_(2)` be `n_(1)` and `n_(2)` respectively.
`therefore` mol. wt. of the mixture `= (32n_(1) + 28 n_(2))/(n_(1) + n_(2))`
`therefore (32 n_(1) + 28 n_(2))/(n_(1) + n_(2)) = 29.12`
At NTP, p = 1 atm.
`therefore` partial pressure of `O_(2) = (n_(1))/(n_(1) + n_(2)) xx p = 0.28 xx 1 = 0.28` atm
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