A Solution Is Prepared by Dissolving 21 $\mathrm { C } _ { 3 }$

A solution is prepared by dissolving 21.0 g of glycerin ( $\mathrm { C } _ { 3 }$ $\mathrm { Hg }$ $\mathrm { O } _ { 3 }$ ) in 201 g of ethanol $\left( \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } \right)$ The freezing point of the solution is ________°C.The freezing point of pure ethanol is $- 114.6 ^ { \circ } \mathrm { C }$ .The molal freezing point depression constant ( $K_f$ ) for ethanol is $1.99 ^ { \circ } \mathrm { Cm } ^ { - 1 }$ The molar masses of glycerin and of ethanol are 92.1 g mol^-1 and 46.1 g mol^-1,respectively.

A) -112.8
B) -116.4
C) 2.26
D) -112.3
E) -116.9

Correct Answer:

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