Ethanol freezing point depression constant

The freezing-point depression constant of pure H2SO4 is 6.12 K kg mol . When 2.3 g of ethanol (C2H5OH) is dissolved in 1.00 kg of pure sulfuric acid, the freezing point of the solution is 0.92 K lower than the freezing point of pure sulfuric acid. Determine how many particles are formed as 1 molecule of ethanol goes into solution in sulfuric acid. 

Challenge A 0.045m solution (consisting of a nonvolatile, nonelectrolyte solute) is experimentally found to have a freezing point depression of 0.08°C. What is the freezing point depression constant (/Cf). Which is most likely to be the solvent water, ethanol, or chloroform ... 

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