In reactions involving oxides and water, carefully balance the equations and count the atoms to ensure accuracy in stoichiometry
The reactions of sodium oxide and dichlorine heptoxide with water are as follows:
\[ Na_2O + H_2O \rightarrow 2NaOH \]
\[ Cl_2O_7 + H_2O \rightarrow 2HClO_4 \]
Adding the coefficients from both equations: 1 +4=5
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.