Question

Mole fraction of solute in $C_6{H}_6$ is 0.2. The molality of solution is

• A. 2.2
• B. 3.2
• C. 4.2
• D. 6.2

Answer 1

The correct option is B 3.2

$x_{solute}=\frac{m}{m+\frac{1000}{Mwofsolvent}}0.2=\frac{m}{m+\frac{1000}{78}}=3.2$