1.

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

Answer»

<P>50
25
37.5
53.5

Solution :`X` (benzene)
`=((78)/(78))/((78)/(78)+(46)/(92))=(1)/(1+0.5)=0.667` `p"(benzene)"=p^(@)"(benzene)"XX x"(benzene)"`
`=75xx0.667=50` TORR


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