A) 23 mm Hg
B) 18 mm Hg
C) 31 mm Hg
D) 35 mm Hg
Correct Answer: A
Solution :
Mass of urea = 5g Mass of water = 100 - 5 = 95g Number of moles of urea \[=\frac{5}{60}=0.083\] Number of moles of water \[=\frac{95}{18}=5.278\] \[\therefore \] Total number of moles = 5.278 + 0.083 = 5.301 Mole fraction of solvent \[=\frac{5.278}{5.361}\] \[{{p}_{s}}=\] Mole fraction of solvent \[\times {{p}^{o}}=\frac{5.278}{5.361}\times 23.5\] = 23.14 mm Hg \[\approx \] 23 mm Hg
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