AIPMT PRELIMS2005Chemistry-Solutions
AIPMT PRELIMS 2005 Chemistry Raoult's Law MCQ Question
Type: MCQ-numerical-Hard-Class 12
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:
A
0.178
B
0.278
C
0.378
D
0.478
Correct Answer
Option D
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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