Final answer:
One mole of solute per liter depresses the freezing point of water by -1.86°C.
Step-by-step explanation:
True. One mole of solute per liter depresses the freezing point of water by -1.86°C. This phenomenon is called freezing point depression. The magnitude of the freezing point depression is directly proportional to the molality of the solution. Freezing point depression is a phenomenon that occurs when a solute is dissolved in a solvent, which in this case is water. The presence of the solute disrupts the ordering process necessary for the solvent to freeze, thereby requiring the removal of additional energy from the solution to allow it to freeze. This results in a lower freezing point compared to the pure solvent.