Benzene and toulene form an ideal solution. The vapour pressure of benzene and toulene are 75 mm and 22 mm at 20°c.If the mole  fraction of benzene  and toulene in vapour phase are 0.63 and 0.37 respectively. Calculate the vapour pressure of ideal mixture.

Asked by sunilpatil4411 | 6th Mar, 2019, 07:34: PM

Expert Answer:

Given:
 
Vapour pressure of benzene PB0 =75 mm Hg
 
Vapour pressure of toluene PT0 = 22 mm Hg
 
Mole space fraction space of space benzene space straight chi subscript straight B equals space 0.63

Mole space fraction space of space toluene space straight chi subscript straight T equals space 0.37

space Partial space pressure space of space benzene space equals space Mole space fraction space of space benzene space cross times space Vapour space pressure space of space benzene space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space
space
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 0.63 cross times 75

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 47.25

Partial space pressure space of space toluene space equals space 0.37 cross times 22

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 8.14

Total space vapour space pressure space of space mixture space equals space Partial space pressure space of space benzene space plus space space Partial space pressure space of space toluene

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 47.25 plus space 8.14

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 55.39 space mm space of space Hg space
 
The total vapour pressure of the mixture is 55.39 mm of Hg.

Answered by Varsha | 7th Mar, 2019, 12:43: PM

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