A solution containg 62 g ethylene glycol in 250 g water is cooled to -10^{0}C . If K_{f} for water is 1.86  K kg mol^{-1}, the amount of water (in g ) separated as ice  is:

  • Option 1)

    16

  • Option 2)

    32

  • Option 3)

    48

  • Option 4)

    64

Answers (1)
A admin

 

Dependence of K_{f} -

K_{f}= \frac{RT_{f}^{2}m}{1ooo\Delta H_{fusion}}

-

 

 

Solutions -

A homogeneous mixture of solute and solvent present in same phase.

- wherein

Eg. Nacl in H2O

 

 

Definition of Boiling -

Boiling occurs at the temperature when the vapour pressure of liquid becomes equal to external atmospheric pressure

- wherein

Boiling point of pure liquid is fixed.

The formula :\Delta T_{f}=K_{f}m

10=1.86\times \frac{62 g/62(g/mol)}{\omega Kg}

\omega _{(kg)}=0.186

\Delta \omega=(250-186)

\Delta \omega=64 gm

 

 


Option 1)

16

Option 2)

32

Option 3)

48

Option 4)

64

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