Question

Mol fraction of I₂ in benzene solvent is x . The density of the solution is d gm/ml. calculate molarity and molality of solution.

Answer 1

Using following formulas, we can find the molality and molarity of the solution:

$$\begin{gathered} x=\frac{m{M}_1}{1000+m{M}_1} \\ Here, \\ \text{x is the mole fraction of solute} \\ \text{m is the molality of solution} \\ {\text{M}}_1\text{is the molecular mass of solvent} \end{gathered}$$

And
$$\begin{gathered} m=\frac{M\times 1000}{1000d-(M\times M_2)} \\ \text{Here}, \\ \text{M is the molarity of solution} \\ {\text{d is the density of solution in g mL}}^{-1} \\ {\text{M}}_2\text{is the molecular mass of solute} \end{gathered}$$