A) 0.982
B) 0.567
C) 0.943
D) 0.018
Correct Answer: D
Solution :
\[\because \] \[\Delta {{T}_{b}}=molality\times {{K}_{b}}\] \[\because \] \[0.52=m\times 0.52\] or molality \[=1\text{ }mol\text{ }k{{g}^{-1}}\] \[\therefore \] No. of moles of urea = 1 mol No. of moles of water\[=\frac{1000}{18}=55.55\text{ }mol\] Mole fraction of urea \[=\frac{moles\text{ }of\text{ }urea}{moles\text{ }of\text{ }urea\text{ }+\text{ }moles\text{ }of\text{ }water}=0.018\] \[=\frac{1}{1+55.55}\]
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