Q10 / 160 · NTA Abhyas (NEET) 2020 · Chemistry · Solutions

Assuming very dilute aqueous solution of urea, calculate the vapour pressure of solution (in mm of Hg) of 0.1 moles of urea in 180 grams of water at 25oC is (The vapour pressure of water at 25oC is 24 mm Hg)

  • A
    2.376
  • B
    20.76
  • Correct answer
    C
    23.76
  • D
    24.76

Solution

From Raoult's law for very dilute solution.

po-pspo=wm×MW

24-ps24=0.1×18180

24-ps=0.24

∴ ps=24-0.24=23.76 mm Hg

Hence, the correct answer is option: 'C'.

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