Question

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

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

Answer 1

Answer: (B)

solute molecules to the total molecules in the solution

Answer 2

According to Raoult's law the relative lowering of vapour pressure is equal to mole fraction of solute, i.e., the ratio of number of moles of solute to total number of moles of all component in solution.