The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, non

Chemistry
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The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT 


How many grams of DDTC14H9Cl5 (354.5 g/mol), must be dissolved in 245.0grams of benzene to reduce the freezing point by 0.400°C ?

 g DDT.
Jun 1st, 2015

Let's first express the molality = m = moles solute/kg solvent.

The solute is DDT and the solvent is benzene. 

Let's call mDDT the mass of DTT (expressed in grams) needed to reduce the freezing point by 0,400 °C.

m=nDDT/0,245=mDDT/(354,5*0,245)

Kf = freezing point constant of benzene : 5,12 

dTf=0,400=Kf*m=Kf*mDDT/(354,5*0,245)

mDDT=dTf*354,5*0,245/Kf

mDDT=6,8 g

Jun 1st, 2015

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