First slide

Theory of dilute solutions

Question

What would be the freezing point of aqueous solution containing 17 g of C₂H₅OH in 1000 g of water. K_fH2O=1.86 K m-1.

Moderate

A

-0.69 $°$ C
B

-0.34 $°$ C
C

0.0 $°$ C
D

0.34 $°$ C

Solution

$∆ T_{f} = \frac{1000 \times 1.86 \times 17}{46 \times 1000} = 0.69 ° C T_{f} = 0 - 0.69 = - 0.69 ° C$

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