Students are investigating a solvent for use in freezing point depression experiments. They measured the freezing point of the solvent as - 12.6°C. The solution they made by dissolving 0.484 g of ethanol (46.07 g/mol) in 8.254 g of the solvent has a freezing point of -18.3°C. Determine the freezing point depression constant, Kf, for the solvent. Select one:
a) 2.3 °C kg / mol
b) 4.5 °C kg / mol
c) 0.97 °C kg / mol
d) 0.22 C.kg / mol
e) 9.0 C kg / mol