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Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)

Correct Answer: 804.32 g

Explanation:

T f   =   k f . m  


for ethylene glycol in aq. solution


  T f   =   k f   w m o l . w t   ×   1000 w t .   o f   s o l v e n t 6   =   1 . 86   x   w   x   1000 62   x   4000


=> w = 800 g


 


So, the weight of solute should be more than 800 g.


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