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Question

Coolant used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at 0.30C. How much ethylene glycol must be added to 5 kg of water? (Kf = 1.86 K Kgmol1)

A
50 g
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B
55 g
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C
45 g
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D
40 g
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Solution

The correct option is A 50 g
Ethylene glycol is C2H6O2.
Therefore, using depression formula,
0.3=1.86×nethyleneglycol5n=1.51.86
Therefore mass of ethylene glycol =1.51.86×62=50 grams

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