Positive deviation from Raoult's law means a mixture whose total pressure is___________________?
Correct answer: C. Greater than that computed for ideality
- A. Less than the sum of the vapour pressure of the components
- B. Less than that computed for ideality
- C. Greater than that computed for ideality
- D. None of these
Explanation
Positive deviation means the unlike-molecule attractions are weaker than those in the pure liquids, allowing more molecules to escape into the vapour. Therefore, the total pressure exceeds the Raoult's-law ideal value.
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