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A solution containing 62 g ethylene glycol in 250 g water is cooled to -10°C. If Kf for water is 1.86 K kg mol⁻¹, the amount of water (in g) separated as ice is:

1. 32
2. 16
3. 64
4. 48

Correct answer: 64

Solution

The freezing point depression can be calculated using the formula Δ T_f = K_f · m, where m is the molality of the solution. Given the mass of ethylene glycol and the freezing point depression, we find that the solution's freezing point drops sufficiently to cause 64 g of water to freeze.

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