The molar mass of calcium nitrate as determined from the colligative properties is found to be 65.6 g mol-1, The degree of dissociation of the salt is

The molar mass of calcium nitrate as determined from the colligative properties is found to be 65.6 g mol-1, The degree of dissociation of the salt is

  1. A

    0.25

  2. B

    0.50

  3. C

    0.75

  4. D

    0.85

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    Solution:

    We have

    Ca3NO32Ca2++2NO3-c(1-α)cα  c(2α)

    Total concentration =c(1-α)+cα+c(2α)=c(1+2α)

     Theoretical molecular mass  Observed molecular mass =(1+2α)116465.6=1+2α1α=0.75

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