Question:
For a binary solution, when a nonvolatile nonelectrolyte solute is dissolved in solvent, the vapour pressure of solvent decreases by 20 % . what is mole fraction of solvent in solution ?
For a binary solution, when a nonvolatile nonelectrolyte solute is dissolved in solvent, the vapour pressure of solvent decreases by 20 % . what is mole fraction of solvent in solution ?
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Relative lowering of vapour pressure equals the mole fraction of solute.
Updated On: Oct 1, 2026
- \(0.02\)
- \(0.08\)
- \(0.2\)
- \(0.8\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Raoult's law for a nonvolatile solute says \(\dfrac{p^0 - p}{p^0} = x_{solute}\).
Step 2: Detailed Explanation:
A 20 percent decrease means \(\dfrac{p^0-p}{p^0} = 0.20\), so \(x_{solute} = 0.20\).
\[ x_{solvent} = 1 - 0.20 = 0.80 \]
Option (C) 0.2 is the solute fraction. Options (A) and (B) are not related to the data.
Step 3: Final Answer:
Mole fraction of solvent is 0.8, option (D).
Final Answer:
Solvent mole fraction is 1 minus the lowering. \[ \boxed{\text{(D) }0.8} \]
Raoult's law for a nonvolatile solute says \(\dfrac{p^0 - p}{p^0} = x_{solute}\).
Step 2: Detailed Explanation:
A 20 percent decrease means \(\dfrac{p^0-p}{p^0} = 0.20\), so \(x_{solute} = 0.20\).
\[ x_{solvent} = 1 - 0.20 = 0.80 \]
Option (C) 0.2 is the solute fraction. Options (A) and (B) are not related to the data.
Step 3: Final Answer:
Mole fraction of solvent is 0.8, option (D).
Final Answer:
Solvent mole fraction is 1 minus the lowering. \[ \boxed{\text{(D) }0.8} \]
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