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The freezing point of ethanol CH3CH2OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves...

The freezing point of ethanol CH3CH2OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is chlorophyll . If 14.52 grams of chlorophyll, C55H72MgN4O5 (893.5 g/mol), are dissolved in 178.5 grams of ethanol ... The molality of the solution is ______ m. The freezing point of the solution is _____ °C.

Solutions

Expert Solution

weight of chlorophyll   = 14.52g

gram molecular weight (G.M.Wt) = 893.5g/mole

weight of solvent (ethanol)             = 178.5g

molality    =   W*1000/G.M.Wt * weight of solvent in g

                 = 14.52*1000/893.5*178.5    = 0.091m

Kf of ethanol   = 1.990C/m

i = 1 for nonelectrolyte

Tf = i*m*Kf

         = 1*0.091*1.99

           = 0.181090C

Tf      = solvent ( Tf) - solution ( Tf)

0.18109   = -117.3 - solution(Tf)

-solution ( Tf) = 0.18109+117.3

solution          = -117.480C

the freezing point of solution = -117.480C

queen_honey_blossom answered 2 years ago
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