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QJEEM07Chf69c: JEE Main 2007 Chemistry - Class 12 JEEM07Chf69c Solution: A mixture of ethyl alcohol and propyl alcohol has a vapour…

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

Multiple Choice Options

  • A 360
  • B 350
  • C 300
  • D 700

Step-by-Step Verified Solution

PA∘=?,

Given PB∘=200mm,xA=0.6

xB=1−0.6=0.4,P=290

P=PA+PB=PA∘xA+PB∘xB

⇒290=PA∘×0.6+200×0.4

∴ PA∘=350mm

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