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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 - 6oC will be :
[f K for water = 1.86 K kg mol ″1 , and molar mass of ethylene glycol = 62g/ mol ]
[f K for water = 1.86 K kg mol ″1 , and molar mass of ethylene glycol = 62g/ mol ]
Options
A.204.30g
B.400.00 g
C.304.60 g
D.804.32g
Solution
ᐃTf = Kf × m = Kf × 
w1 & w2 = wt of solvent & solute respecting
m2 = mw of solute
ᐃTf = 0o - ( - 6o) = 6 1.86 ×
Therefore w2 = 800g
w1 & w2 = wt of solvent & solute respecting
m2 = mw of solute
ᐃTf = 0o - ( - 6o) = 6 1.86 ×
Therefore w2 = 800g
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