Henry's Law:
Henry's law states that: The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid at constant temperature.
Mathematically: \[ C \propto P \quad \Rightarrow \quad C = k_H \cdot P \] where:
A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y' (molar mass = 300 g mol$^{-1}$) led to an elevation of the boiling point by 0.5 K. The relative lowering in the vapour pressure of the solvent 'Y' is $____________ \(\times 10^{-2}\). (nearest integer)
[Given : $K_{b}$ of the solvent = 5.0 K kg mol$^{-1}$]
Assume the solution to be dilute and no association or dissociation of X takes place in solution.