Question

Molality of an aq. solution of urea having mole fraction $0.2$ is

• A. $9.37m$
• B. $24.67m$
• C. $17.47m$
• D. $13.88m$

Answer 1

Answer: (D)

$m=\frac{X_A}{X_{{}_B}}\times \frac{1000}{M_B}$
$m=\frac{0.2}{0.8}\times \frac{1000}{18}$
$m=13.88$