What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.

- 1.5 °C

Explanation:

The depression of the freezing point is a colligative property which is given by the equation:

ΔTf = Kf × m × i

Where:

ΔTf is the depression on the freezing point of the pure solute caused by the addition of a nonvolatile solute.m is the molality of the solution.i is the Van't Hoff factor, which accounts for the number of particles into which the solute ionizes. It is 1 for solutes that do not dissociate, which is the case of the radiator fluids.

The calculations step-by-step are in the attached file. Please, open the pdf file with the complete explanation.