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MHT CET20227 Aug 2022Evening ShiftChemistrySolutionsActual

Find the molar mass of solute when 2 gram dissolved in 60 gram benzene at 30^ C and relative lowering of vapour pressure is 0.06 . (Molar mass of benzene is 78 ~g ~mol )

Options

  1. A17.4 gram mol ⁻¹
  2. B35.2 gram mol-1
  3. C43.3 gram mol ⁻¹
  4. D24.2 gram mol-1

Correct answer

C. 43.3 gram mol ⁻¹

Step-by-step solution

P P _ A ^ = W _ B M _ B M _ A W _ A 0.06= 2 M_B 78 60 M_B= 78 30 0.06 =43.3 ~g / mol

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