Question

The equation used to calculate the change in freezing point (ΔTf) of a substance is:_______

Answer 1

Answer:

B. As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality.

Explanation:

Molality is given by the following equation:

$Molality = \frac{moles of solute}{kg of solvent}$

While the molarity formula is given as

$Molarity=\frac{moles of solute}{Lof solvent}$

The volume of solvent changes with temperature so it will be impractical to use molarity as it accounts for the volume of solution in its formula, which will create an error. Molality, on the other hand, uses Kg of solvent; which is not dependent on temperature. Hence, its value will not change