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What is vapour pressure ?...

What is vapour pressure ?

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At 88^(@)C benzene has a vapour pressure of 900 torr and toluene has vapour pressure of 360 torr. What is the mole fraction of benzene in the mixture with toluene that will be boil at 88^(@)C at 1 atm pressure, benzene- toluene form an ideal solution.

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The vapour pressure of benzene at 90^(@)C is 1020 torr. A solution of 5g of a solute in 58.5g benzene has vapour pressure 990 torr. The molecular weight of the solute is?