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Question: Answered & Verified by Expert
64 g non-volatile solute is added to 702 g benzene. The vapour pressure of benzene has decreased from 200 mm of Hg to 180 mm of Hg . Molecular weight of the solute is
ChemistrySome Basic Concepts of ChemistryNEET
Options:
  • A 128
  • B 64
  • C 96
  • D 256
Solution:
1987 Upvotes Verified Answer
The correct answer is: 64
V.P. has decreased by 10%
This happens only when 9 moles solvent & one mole solute are present
702 g benzene = 9 moles
64 g=1 mole

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