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Car radiators use an aqueous ethylene glycol solution as antifreeze. How much ethylene glycol should be mixed with 5 kg of water so that the freezing point is lowered to -0.3 °C? (K_f = 1.86 K kg mol⁻¹)

1. 50 kg
2. 50 g
3. 45 g
4. 40 g

Correct answer: 50 g

Solution

The correct option is 50 g because to achieve a freezing point depression of -0.3 °C, the calculated amount of ethylene glycol needed, based on the freezing point depression formula, is approximately 50 g when mixed with 5 kg of water.

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