alleryThe relative lowering of vapour pressure of a dilute solution of a non-volatile solute equals:
AThe mole fraction of solute
BThe mole fraction of solvent
CThe volume of solvent
DThe mass of solute
Answer & Solution
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.
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