The relative lowering of vapour pressure of a dilute solution of a non-volatile solute equals:
- The mole fraction of solute
- The mole fraction of solvent
- The volume of solvent
- The mass of solute
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Correct answer: A. The mole fraction of solute
**From Raoult:** $\Delta P / P_1^0 = (P_1^0 - P_1)/P_1^0 = x_2$ (mole fraction of solute).
This is one of the four classical colligative properties.