A solution containing 0.2563g of naphthalene (molecular mass = 128) in 50g of carbon tetrachloride yields a boiling point elevation of `0.201^(@)C` while a solution of 0.6216g of an unknown solute in the same mass of the solvent gives a boiling point elevation of `0.647^(@)C`. Find the molecular mass of the unknown solute.

Explanation

To find the molecular mass of the unknown solute, we will follow these steps:

### Step 1: Calculate the molality of the naphthalene solution.
The formula for boiling point elevation is given by:
\[ \Delta T_b = K_b \cdot m \]
Where:
...