Question

The vapour density of a mixture containing No2 and N2o4 is 27.6. What is the mol fraction of No2in the mixture

Answer 1

let mole fraction of NO2 is x,then mole fraction of N2O4 is (1-x).
Molecular wt. net = (mole fraction of NO2 × molecular wt +mole fraction of N2O4 ×molecular wt.)
=x × 46 +(1-x)92
=92-46x
vapor density = molecular wt. net /2
vd=(92-46x)/2=46-23x
43-26x=27.6
26x=15.4
x=15.6/26