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Depression in Freezing Point

In a cold cli...

Question

In a cold climate, water gets frozen causing damage to radiator of a car. Ethylene glycol is used as antifreezing agent. Calculate the amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at $- 6^{o} C (K_{f}$ for water =1.85 K kg $m o l^{- 1}$

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Solution

Given,
$△ T = 6^{o} C, W = 4 k g = 4000 g, m = 62, K_{f} = 1.85$
$w = \frac{m \times W \times △ T}{1000 \times K_{f}}$
$= \frac{62 \times 4000 \times 6}{1000 \times 1.85} = 804.32 g$

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