To find the freezing point of the solution, the first step is to find the molality of the solution, which is used in the freezing depression equation.
The freezing depression equation states the following:
ΔTf = kf.m.i
ΔTf = change in freezing temperature, related to the solvent
kf = freezing point depression constant, which depends on the solvent.
m = molality
i = number of particles of solute when it dissolves.
The only previous calculation needed to solve this question is finding the molality, which is how many moles of solute there are in 1 kg (1000 g) of solvent.
Therefore, we calculate ethylene glycol's molar mass