Q. 3.65 g of $HCl$ is dissolved in 16.2 g of water. The mole fraction of HCl in the resulting solution is
A) 0.1
B) 0.2
C) 0.3
D) 0.4
Explanation
(a)
$\mathcal{X =}\frac{n}{n + N}$
$n = \frac{w}{m} = \frac{3.65}{36.5} = 0.1$
$N = \frac{W}{M} = \frac{16.2}{18} = 0.9$
$\mathcal{X =}\frac{0.1}{0.1 + 0.9} = 0.1$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.