Kf or water is 1.86 K kg mol–1. If you 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

Engineering

Chemistry

vant Hoff Factor

Depression in Freezing Point

Question

K_for water is 1.86 K kg mol^–1. If you 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 –2.8°C?

93 g

27 g

72 g

39 g

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${ΔT}_{f} = K_{f} \times m or 2 .8 = 1 .86 \times \frac{W / 62}{1}$

$∴$ W = 93