1.

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 : [K_(f) for water ="1.86 K kg mol"^(-1), and molar mass of ethylene glycol = "62 g mol"^(-1)]

Answer»

204.30g
400.00 g
304.60 g
804.32 g

Solution :`DeltaT_(f)=(1000K_(f)w_(2))/(w_(1)M_(2))""therefore""6=(1000xx1.86xxw_(2))/(4000xx62) or w_(2)=800g`


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