The relative lowering of the vapour pressure is equal to the ratio between the number of (a) Sol...

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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.
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