1.

Benzene and toluene form nearly ideal solution. At 20^(@)C, the vapour pressure of benzene is 75 torr and that of toluene ios 22 torr. The partial vapour pressure of benzene at 20^(@)C for a salution containing 78 g of benzene and 46 g of toluene in torr is :

Answer»

<P>50
25
37.5
53.5

Solution :`P_(B)^(@)=75"TORR"`
`X_(B)=(((78g))/((78gmol^(-1))))/(((78g mol^(-1)))/((78g mol^(-1)))+((46G))/((92gmol^(-1))))`
`P_(B)^(@)=P_(B)^(@)X_(B)=75"torr"xx1/1.5=50 "torr"`


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