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Q.

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 -6oC will be (Kf for water = 1.86 K kg mol-1 and molar mass of ethylene glycol =62 g mol-1)

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a

804.32 g

b

204.30 g

c

400.00 g

d

304.60 g

answer is A.

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Detailed Solution

∆Tf=1000Kfw1m1w2=0o--6oC=6oC ∴    6=1000×1.86×w162×4000 ⇒  w1=800 g≈804.32 g
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