Question

The mole fraction of water in 20% (wt. / wt.) aqueous solution of $H_2{O}_2$ is:

• A. $\frac{77}{68}$
• B. $\frac{68}{77}$
• C. $\frac{20}{80}$
• D. $\frac{80}{20}$

Answer 1

Answer: (B)

$\frac{68}{77}$

The mole fraction of water = $\frac{80/18}{80/18+20/34}$ = $\frac{68}{77}$

The mole fraction of water in $20$% ($wt./wt.$) aqueous solution of $H_2{O}_2$ is $\frac{68}{77}$