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Liquids A and B form an ideal solution i...

Liquids A and B form an ideal solution in the entire composition range. At 350K, thee vapour pressures of pure A and B are `7xx10^(3)Pa` and `12xx10^(3)Pa`, respectively. The total vapour pressure in equilibrium with a solution containing 40 mole percent of A at this temperature is `1xx10^(x)Pa`. The numerical value of x is __________.

Text Solution

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The correct Answer is:
4
`P__(A)^(@)=7xx10^(3)P_(a)`
`P_(B)^(@)=12xx10^(3)P_(a)`
`P_(A)=P_(A)^(@)x_(A)` `P_(B)=P_(B)^(@)x_(B)`
`=[7xx10^(3)][0.4]=[12xx10^(3)][0.6]`
`=2.8xx10^(3)=7.2xx10^(3):P_(T)=1xx10^(4)Pa`
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