The relative lowering in vapour pressure is proportional to the ratio of number of

Options

A. Solute molecules to solvent molecules
B. Solvent molecules to solute molecules
C. Solute molecules to the total number of molecules in solution
D. Solvent molecules to the total number of molecules in solution

Answer

C

Explanation

According to Raoult.s law the relative lowering of vapour pressure is equal to the ratio of number of moles of solute to total number of moles of all component in solution. It is given by the formula:
`(p^@ - p_8)/(p^@) = (n_2)/(n_1 + n_2)`