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Question

The freezing point of a solution containing 50 cm3 of ethylene glycol in 50 g of water is found to be 34 C. Assuming ideal behaviour, calculate the density of ethylene glycol. (Kf for water =1.86 K kg mol1)

A
2.00 g/mL
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B
1.13 g/mL
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C
2.96 g/mL
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D
4.32 g/mL
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Solution

The correct option is B 1.13 g/mL
ΔT=Kf×W2×1000Mw2×W1
34=1.86×W2×100062×50
W2=56.66 g
Volume=W2d
Density=56.6650
=1.13 g cm3

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