The vapour pressure of benzene at `25^(@)C` is `639.7`mmHg and the vapour pressure of solution of a solute in benzene at the same temperature is `631.9mm` of mercury. Calculate the molality of the solution

Explanation

To solve the problem of finding the molality of the solution, we will follow these steps:

### Step 1: Calculate the Relative Lowering of Vapor Pressure
The relative lowering of vapor pressure can be calculated using the formula:

\[ \text{Relative lowering} = \frac{P^0 - P_s}{P^0} \]
...