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 from freezing at – 6° C will be (Kf for water = 1.86 K kg mol–1, and molar mass of ethylene glycol 62 gmol

Engineering

Chemistry

vant Hoff Factor

Depression in Freezing Point

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 from freezing at – 6° C will be (K_f for water = 1.86 K kg mol^–1, and molar mass of ethylene glycol 62 gmol^–1)

304.60 g

400.00 g

204.30 g

804.32 g

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$∆$ T_f = iK_fm

T_f = 6ºC

i = 1

$6 = 1 \times 1.86 \times \frac{w}{{62 \times 4}}$

w = 804.32 g.