The relative of vapour pressure is equal to the ratio between the number of

Options

A. solvent molecules to the total number of ions of the solute
B. solvent molecules to the total molecules in the solution
C. solute molecules to the molecular in the solution
D. solute molecules to the solvent molecules

Answer

2

Explanation

According to second Raoult's law, the relative lowering of vapour pressure of an ideal solution obtained by dissolving a non-volatile solute in a volatile solvent is equal to the mole fraction of the solute in the solution.
`(P_(1)^(0)-P^(0))/P_(1)^(0)X_(2)=n_(2)/(n_(1)+n_(2))`
Note that ratio of moles is equal to the ratio of molecules.