The density of an unknown gas and `O_(2)` were find `0.2579 kg//m^(3)` and `0.2749 kg//m^(3)` at the same `P` and `T` Calculate the mol weight of unknown gas .

Explanation

`P xx V = (w)/(m)RT = (d)/(m)RT`
or `P = (w)/(V xxm)RT = (d)/(m)RT`
For gas ` P =(0.2579)/(m) RT`
`( :' 0.2559 kg//m^(3) = 0.2579g//litre)`
For `O_(2) P=(0.2749)/(32)RT`
`:. m =30.02` .