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Vapour pressure of pure A(p(A)^(@))=100 ...

Vapour pressure of pure `A(p_(A)^(@))=100` mm Hg
Vapour pressure of pure `B(p_(B)^(@))= 150` mm Hg
2 mol of liquid A and 3 mol of liquid B are mixed to form an ideal solution. The vapour pressure of solution will be:

A

`a.) 185 mm`

B

`b.) 130 mm`

C

`c.) 148 mm`

D

`d.) 145 mm`

Text Solution

Verified by Experts

The correct Answer is:
b
`chi_(A)=(2)/(5),chi_(B)=(3)/(5)`,
Using Raoult's law equation,
`P_("total")=p_(A).^(@)chi_(A)+p_(B).^(@)chi_(B)`
`=100xx(2)/(5)+150 xx(3)/(5)=40 + 90 =130`
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