The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT .
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.
Kf = freezing point constant of benzene : 5,12
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