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At 70^@C vapour pressure of pure benezen...

At `70^@C` vapour pressure of pure benezene and pure toluene are 500 torr and 200 torr, respectively. In a homogeneous mixture of toluene with benzene at `70^@C`, the mole fraction of benezene is 0.4. Calculate the vapour pressure of the mixture.

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Vapour pressure of the mixture (P) is the sum of the total partial pressures of the components.
`P = p_1 X_1 + p_2X_2 = 500 xx 0.4 + 200 xx 0.6`
Vapour pressure of mixture = `200 + 120 = 320` torr .
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