Non-ideal Deviations
Positive deviation from Raoult's Law occurs when intermolecular interactions in mixture are:
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- non-ideal deviations
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Weaker than pure components
- Ideal Case: Interactions A2˘013A,B2˘013B, and A2˘013B are equally strong.
- Positive Deviation: Occurs when the attractive forces between unlike molecules (A2˘013B) are weaker than those between like molecules (A2˘013A or B2˘013B).
- Escaping Tendency: Because A and B do not like each other as much, they escape into the vapor phase more easily than expected.
- Observation: This results in a total vapor pressure that is higher than predicted by Raoult's Law (Ptotal>xAPA∘+xBPB∘).
- Example: Ethanol and Cyclohexane. Cyclohexane breaks the hydrogen bonds in ethanol, increasing vapor pressure.
This medium difficulty chemistry question is from the chapter solutions, covering the topic of non-ideal deviations. It appeared in the 2025 exam.
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