Q. The mole fraction of water in 20% aqueous solution of $H_{2}O_{2}$ is
A) $\frac{20}{80}$
B) $\frac{80}{20}$
C) $\frac{68}{77}$
D) $\frac{77}{68}$
Explanation
(c)
Mole fraction of $H_{2}O = \frac{\frac{80}{18}}{\frac{80}{18} + \frac{20}{24}} = \frac{68}{77}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.