Urea forms an ideal solution. Determine the vapour pressure of an aqueous solution containing `10` per cent by mass of urea at `40^(@)C` (Vapour pressure of water at `40^(@)C=55.3mm Hg`).

Explanation

To determine the vapor pressure of an aqueous solution containing 10 percent by mass of urea at 40°C, we can follow these steps:

### Step 1: Understand the Given Data
- The mass percentage of urea in the solution = 10%
- The vapor pressure of pure water at 40°C (P°) = 55.3 mm Hg
- Assume the total mass of the solution = 100 g

### Step 2: Calculate the Mass of Urea and Water
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