Answer:
0.366m = Molality of the solution
Step-by-step explanation:
To solve this question we must know the addition of a solute produce decreasing in freezing point regard to the pure solvent. The equation is:
ΔT = m*Kf*i
Where ΔT is change in freezing point
(As freezing point of water is 0°C, the ΔT is 2.72°C)
Kf is freezing point depression constant = 1.86°C/m for water
i is Van't Hoff factor. The number of ions produced when 1 mole of the salt is dissolved = 4 ions for Fe(ClO₃)₃, Fe³⁺ and 3 ClO₃⁻ ions
m is molality of the solution.
Replacing:
2.72°C = m*1.86°C/m*4
0.366m = Molality of the solution