Find the molality of a solution containing a non-volatile solute if the vapour pressure is `2%` below the vapour pressure or pure water.

Explanation

To find the molality of a solution containing a non-volatile solute when the vapor pressure is 2% below the vapor pressure of pure water, we can follow these steps:

### Step 1: Understand the Vapor Pressure Lowering
The vapor pressure of the solution (Ps) is 2% lower than the vapor pressure of pure water (P0). This means:
\[ Ps = P0 - 0.02 \times P0 = 0.98 \times P0 \]

### Step 2: Use Raoult's Law
According to Raoult's Law, the lowering of vapor pressure can be expressed as:
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