Question

What is the molality of pure water at $273\mathrm{K}$?

Answer 1

1. The molality is defined as the number of moles of solute to the weight of solvent.
2. The abnormal behavior of the water can be seen at different temperatures, which is related to the concentration.
3. There are many factors that are used to check the strength of the solution and molality is one of them.

Formula used

$\mathrm{Molarity}=\frac{\mathrm{moles}}{\mathrm{weight}\mathrm{of}\mathrm{pure}\mathrm{water}}$

Given values

The molar mass of pure water= $18.0153{\mathrm{gmol}}^{-1}$

Number of moles of water= $55.348$

Weight of solvent= $0.99707\mathrm{kg}$

Substituting the values in the formula of Molarity

$$\begin{gathered} \mathrm{Molarity}=\frac{55.348}{0.99707} \\ \mathrm{Molarity}=55.510\mathrm{m} \end{gathered}$$

Thus, the molality of pure water at $273\mathrm{K}$is $55.510\mathrm{m}$