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Ethylene glycol is used as an antifreeze...

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 for water `= 1.86 "K kg mol"^(-1)`, and molar mass of ethylene glycol `= 62 g "mol"^(-1)` )

A

400.00 g

B

304.60 g

C

804.32 g

D

204.30 g

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaT_(f)=(K_(f)xx1000xxw_(2))/(w_(1)xxM_(2))`
`6=(1.86xx1000xxw_(2))/(4000xx62)`
`w_(2)=(6xx4000xx62)/(1.86xx1000)=800g`
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