A) \[37.5\text{ }g\]
B) \[73.5\text{ }g\]
C) \[53.7\text{ }g\]
D) \[75.3\text{ }g\]
Correct Answer: A
Solution :
We know that, \[Molality=\frac{moles\text{ }of\text{ }solute}{~mass\text{ }of\text{ }solvent\,(in\text{ }kg)}\] \[\because \] \[mass\text{ }of\text{ }solvent=\frac{mass}{molar\,mass}\] So, \[Molality=\frac{\frac{mass}{molar\,mass}}{mass\,of\,solvent\,(in\,kg)}\] \[0.25=\frac{60}{2.5}\] (\[\because \] Molar mass of urea = 60) or Mass\[=0.25\times 2.5\times 60\] \[=37.5g\]
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