Depression in Freezing Point

What would be...

Question

What would be the freezing point of an aqueous solution containing 17 g of $C_{2} H_{5} O H$ in 1000 g of water. $K_{f H_{2} O} = 1.86 K m^{- 1}$ :

- {0.69}^{o} C

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- {0.34}^{o} C

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{0.0}^{o} C

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{0.34}^{o} C

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Solution

The correct option is A $- {0.69}^{o} C$
$Δ T_{f} = \frac{1000 \times 1.86 \times 17}{46 \times 1000} = {0.69}^{o} C$
$T_{f} = 0 - 0.69 = - {0.69}^{o} C$

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