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At 25^(@)C, the vapour pressure of pure ...

At `25^(@)C`, the vapour pressure of pure methyl alcohol is 92.0 torr. Mol fraction of `CH_(3)OH` in a solution in which vapour pressure of `CH_(3)OH` is 23.0 torr at `25^(@)C`, is:

A

0.25

B

0.75

C

0.5 0

D

0.66

Text Solution

Verified by Experts

The correct Answer is:
A
`{:(P_(CH_3OH)=92 "torr"),(" "P_(sol)=23 "torr"):}}=chi_B=(92-23)/92=0.75,chi_A=0.25`
`chi_A=0.25`
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