The freezing point of the solution is - 2.15.
The freezing point is the point at which a liquid is changed to solid. We can use the formula;
ΔT = K m I
ΔT = temperature change
K = freezing constant of benzene
m = molality
i = Van't Hoff factor
Now;
ΔT = 5.12°C/m * 0.655 m * 1
ΔT = 3.35°C
ΔT = Freezing point of pure benzene - Freezing point of solution
Freezing point of solution = ΔT - Freezing point of pure benzene
= 3.35°C - 5.5 °C = - 2.15
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