Question: If 1 mole of a non-electrolyte solute is dissolved in 1 kg of water, what is the freezing point depression?

Options:

1. 0 °C
2. 1.86 °C
3. 3.72 °C
4. 5.58 °C

Correct Answer: 1.86 °C

Solution:

The freezing point depression is calculated using the formula ΔTf = i * Kf * m. For a non-electrolyte, i = 1, Kf for water = 1.86 °C kg/mol, and m = 1 mol/kg gives ΔTf = 1.86 °C.