Question

The vapour density of a mixture containing $N{O}_2$, and $N_2{O}_4$ is 27.6.The mole fraction of $N_2{O}_4$ in the mixture is

• A. 0.1
• B. 0.2
• C. 0.5
• D. 0.8

Answer 1

The correct option is B 0.2

Let $1$ mole of mixture has $x$ mole $N_2{O}_4$
$2\times 27.6=x\left(92\right)+(1-x)46$;
$x=0.2$