AIPMT PRELIMS 2005 Chemistry Raoult's Law MCQ Question
A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be:
0.178
0.278
0.378
0.478
Correct Answer
Detailed Explanation
Using Raoult's law and Dalton's law, the partial pressure of pentane is calculated, and the mole fraction in the vapour phase is determined using the total pressure.
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