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 parial vapour pressure of benzene at 20°C for a solution containing 78g of benzene and 46g of toluene in torr is
50
25
37.5
53.5
As we learned
Raoult's Law -
The partial pressure of any volatile constituents of a solution at a given temperature is equal to the product of vapour pressure of pure constituent and its mole fraction in the solution.
- wherein
and are vapour pressures of pure liquids.
and are vapour pressures of A and B respectively.
Option 1)
50
Option 2)
25
Option 3)
37.5
Option 4)
53.5
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