Kf for water is 1.86 K kg mol-1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to -2.8o C ?

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72 g

93 g

39 g

27 g

answer is B.

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Detailed Solution

Coolant glycol (C2H6O2)is a non-electrolyte. ∆Tf=2.8o ∆Tf=100Kfw1m1w2 ⇒ 2.8=1000×1.86×w162×1000 ∴ w1=93.33 g≈93 g

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