An antifreeze solution is prepared containing 40.0 g of ethylene glycol (molar mass = 62.0 g/mol) in 60.0 g of water. calculate the freezing point of this solutions a.-20.1°c b.0.518°c c.20.1°c d.120.1°c
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Ответ:
Number of moles :
Molar mass ethylene glycol = 62.0 g/mol
40.0 / 62.0 => 0.645 moles
Molality :
mass of solvent = 60.0 / 1000 => 0.06 kg
m = moles / kg solvent
m = 0.645 / 0.06
= 10.75 m
Δt = Kf x molality
Δt = (- 1.86) x 10.75 => - 20.1ºC
Answer A
hope this helps!
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