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45g of ethylene glycol is mixed with 600g of water. What is the freezing point of the solution? kf=1.86Kkgmol-1


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Solution

45 g of ethylene glycol is mixed with 600 g of water.
The molar mass of ethylene glycol =62 g/mol
Moles of ethylene glycol=4562=0.726 moles.
600g of water =0.600kg of water.
Molality (m): The number of moles of solute dissolved in 1000g (1 kg) of a solvent is known as the molality of the solution.
Molality(m)=MolesofsoluteMassofsolvent(inGram)×1000

Molality(m)=0.726600×1000=1.21m

The depression in the freezing point ΔT =kf×m
T=kf×m=1.86×1.21=2.25K
​The freezing point of pure water =273.15 K.
The freezing point of solution =273.15+2.25=270.90 K

45g of ethylene glycol is mixed with 600g of water. The freezing point of the solution is 270.90K.


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