GlegselerJessaysot GlegselerJessaysot

06-02-2017
Chemistry

Answered

How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep it from freezing at -20 oC?

Kf = 1.86 oC/m.

Verified Answer :

MissPhiladelphia MissPhiladelphia

10-02-2017

Colligative
properties calculations are used for this type of problem. Calculations are as
follows:

ΔT(freezing point) = -(Kf)m
-20.0 = -1.86 °C kg / mol (m)
m = 10.75 mol/kg

10.75 mol C2H6O2 / kg water ( 1 L water ) ( 1 kg/L ) (62.07 g/mol )= 667.25 g

Hope this answers the question. Have a nice day.

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