Question

Mole fraction of a solute in an aqueous solution is 0.2. The molality of the solution will be :

• A. 13.88
• B. 1.388
• C. 0.138
• D. 0.0138

Answer 1

The correct option is A 13.88

Given that

$x_B=0.2,x_A=0.8$
Now,

$Molality\left(m\right)=\frac{x_B\times 1000}{x_A\times M_A}=\frac{0.2\times 1000}{0.8\times 18}=13.88m$

where,

$M_A=$ molar mass of solvent