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  • 83 g of ethylene glycol dissolved in 625 g of water. The freezing point of the solution is ________K. (Nearest integer) [Use : Molal Freezing point depression constant of water = 1.86 K kg mol-1 , Freezing point of water = 273 K, Atomi

83 g of ethylene glycol dissolved in 625 g of water. The freezing point of the solution is ________K. (Nearest integer) [Use : Molal Freezing point depression constant of water = 1.86 K kg mol-1 , Freezing point of water = 273 K, Atomic masses :  \mathrm{C:12.0\, u ,O:16.0\, u ,H : 1.0\, u} ]
 

Answers (1)

best_answer

The structure of Ethylene Glycol is given below: 

Molar mass of Ethylene Glycol = 62 g

\therefore Moles of Ethylene Glycol = \frac{83}{62}

\mathrm{\therefore molality= \frac{83\times 1000}{62\times 625}= 2.14}

Now,

\begin{aligned} \Delta T_{f} &=K_{f} \times m \\ &=1.86 \times 2.14 \\ &=3. 98 K \\ & \cong 4 K \end{aligned}

\mathrm{\therefore Freezing\; point= \left ( 273-4 \right )K= 269\ K}

Hence, the answer is 269

Posted by

sudhir.kumar

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