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At a given temperature, total vapour pre...

At a given temperature, total vapour pressure in Torr of a mixture of volatile components A and B is given by
` P = 120 - 75X_(B)`
hence vapour pressure ofpure A and B respectively ( in Torr) are :

A

120, 75

B

120, 195

C

120, 45

D

75, 45

Text Solution

Verified by Experts

The correct Answer is:
A
`p=120-75x_(B)`
For pure B, `" " x_(B)=1`
So, `p_(B)^(@)=120-75xx1=45` torr
For pure A, `x_(A)=1` or `x_(B)=0`
`p_(A)^(@)=120-75xx0=120` torr
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