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The vapour pressure of pure benzene and ...

The vapour pressure of pure benzene and toluene at a particular temperature are 100 mm and 50 mm respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is

A

0.67

B

0.75

C

0.33

D

`0.50`

Text Solution

Verified by Experts

The correct Answer is:
A
Total vapour pressure, `p_("total") = p_1 + p_2`
`= 100 + 50`
`=150` mm
`therefore` Mole fraction of benzene in solution,
`x = (p_1)/( p_1 + p_2)`
`= (100)/( 150) = (2)/(3) = 0.67`
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