A solution of30 g of an unknown compound in 116 g of solvent (molar mass =58gmol−1 has vapour pressure of 0.475 atm. If the vapour pressure of pure solvent is 0.5 atm, the molar mass of unknown compound is

A solution of30 g of an unknown compound in 116 g of solvent (molar mass =58gmol1 has vapour pressure of 0.475 atm. If the vapour pressure of pure solvent is 0.5 atm, the molar mass of unknown compound is

  1. A

    100g mol1

  2. B

    200g mol1

  3. C

    250g mol1

  4. D

    300g mol1

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    Solution:

    M2=m2m1/MlΔp1/pl M2=30g116g/58gmol1(0.025atm/0.5atm) M2=300gmol1

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