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Question
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 form freezing at - 6° C will be : (Kf for water = 1.86 K kg mol-1, and molar mass of ethylene glycol = 62g mol-1)
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804.32 g
-
204.30 g
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400.00 g
-
304.60 g
Solution
A.
804.32 g
ΔTf = iKfm
ΔTf = 6ºC
w1 = mass of ethylene glycol in grams
w2 = mass of solvent (H2O) in grams= 4000g
m1 = Molar mass of ethylene glycol = 62 g
i = 1
i is van't off factor
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