Vapour density of a mixture containing no2 and n2o4


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the vapour density of a mixture containing No2 and N2o4 is 27.6. the mole fraction of N2O4 in the mixture is

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Molar mass of the mixture = 27.6 x 2 = 55.2 g
Let x moles of
N2o4 be present in the 100 mole mixture

So,(100-x) x 46 + 92x
= 100 x 55.2
=> 100 - x + 2x = 5520/46 = 120
=> 100 + x = 120
=> x = 20

Hence,mole fraction of N2O4 in the mixture = 20/100 = 0.2

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