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

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

Solution:

$m=\frac{X_{A}}{X_{_B}}\times\frac{1000}{M_{B}}$
$m=\frac{0.2}{0.8}\times\frac{1000}{18}$
$m=13.88$