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# The mole fraction of water in 20% aqueous solution of $H_2O_2$ is :

$\begin{array}(a)\;\large\frac{77}{68}&(b)\;\large\frac{68}{77}\\(c)\;\large\frac{20}{80}&(d)\;\large\frac{80}{20}\end{array}$

mole fraction of water =$\large\frac{80/18}{80/18+20/34}$
$\Rightarrow \large\frac{68}{77}$
Hence (b) is the correct option.