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 1 year ago

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