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Q.

The depression in freezing point of water containing ethylene glycol is 7.4°C. Find the mass of ethylene glycol added in 500g water
(K_f = 1.86 K kg mol^–1)

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a

23.3g

b

12.33g

c

123.3g

d

233.3g

answer is C.

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Detailed Solution

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$Given, ∆ T_{f} = 7.4 ° c, W_{s} (ethyleneglycol) = ?, W_{o} (solvent) = 500 g Molar mass of C_{2} H_{6} O_{2} = 62 g ∆ T_{f} = K_{f} \times \frac{W_{s}}{Molar mass} \times \frac{1000}{W_{o}} 7.4 = 1.86 \times \frac{W_{s}}{62} \times \frac{1000}{500} W_{s} = 123.3 g$

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The depression in freezing point of water containing ethylene glycol is 7.4°C. Find the mass of ethylene glycol added in 500g water(Kf = 1.86 K kg mol–1)