20 g of solute was added to 100 g of water at `25^(@)C`. The vapour pressure of water and that of solution were 23.76 mm Hg and 22.41 mm Hg respectively at the temperature. Calculate the relative molecular mass of the solute.

Explanation

To solve the problem step by step, we will use the concept of relative lowering of vapor pressure. Here’s how we can calculate the relative molecular mass of the solute.

### Step 1: Write down the given data
- Mass of solute (B) = 20 g
- Mass of solvent (water, A) = 100 g
- Vapor pressure of pure water (P₀) = 23.76 mm Hg
- Vapor pressure of the solution (P) = 22.41 mm Hg

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