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# Calculating the Vapor Pressure of a Benzene and Water Solution?

At 25 degrees celsius, benzene (C6H6) has a vapor pressure of 18.1 kPa. Calculate the vapor pressure of a 20 degrees celsius benzene and water solution with a benzene mole fraction of 0.5.

Can someone please explain to me how to do this problem?

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- DoctorwhoLv 78 years agoFavorite Answer
we need the vapor pressure of water at 20 °C for the calculation.

p(total) = (p(benzene))*(mole fraction benzene) + (p(water))*(mole fraction water)

p(total) = (18.1 kPa)*(0.5) + (p(water))*(0.5)

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