Multiple choice

Calculate the freezing point of an aqueous 45.0% ethylene glycol mixture. For water, Kf = 1.86oC kg mol-1.

    • 1.86oC
    • 1.86oC

  3. 0oC
    • 24.7oC
    • 24.7oC
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Correct answer. 100.0 g of 45% mix: 45.0 g C2H2(OH)2 + 55.0 g H2O nglycol = 45.0 g / 62.0 g mol-1 = 0.73 mol mglycol = (0.73 mol / 0.055 kg) = 13.272 mol Kg-1 ΔTf = (1.86oC kg mol-1) x (13.272 mol Kg-1) = 24.7oC Freezing point = 0.00°C – 24.7°C = -24.7oC

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