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Ethylene glycol is used as an antifreeze...

Ethylene glycol is used as an antifreeze agent. Calculate the amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at `-6^@C`.
`(K_f " for " H_2O = 1*85 K "mole"^(-1) kg)`

A

204.30 g

B

400.00 g

C

304.60 g

D

804.32 g

Text Solution

Verified by Experts

`DeltaT_(f)=K_(f)xxm=K_(f)xx(w_(2)xx1000)/(w_(a)xxm_(2))`
`w_(1)` & `w_(2)=wt` of solvent & solute respectively
`m_(2)=` molecular mass of solute
`DletaT_(f)=0^(@)-(-6^(@))=6=1xx1.86xx(w_(2)xx1000)/(4000xx62)`
Therefore `w_(2)=800g`
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