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Standard XII

Chemistry

Raoult's Law

64. Benzene a...

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64. Benzene and toluene forms nearly an ideal solution. At 300K P^° toluene=32.6 mm and P^° benzene=103.01 mm 1. A liquid mixture is composed of 3 mole of toluene and 2 mole of benzene. If the pressure over the mixture at 300K is reduced, at what pressure does the first vapour form? 2. What is the composition of the first trace of vapour formed? 3. If the pressure is reduced further, at what pressure does the last trace of liquid disappear? 4. What is the composition of last trace of liquid?

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Benzene and toluene form nearly ideal solution .At 313K the vapour pressure of pure benzene is 150mm Hg and of pure toluene is 50 mm Hg .calculate vapour pressure of mixture of these two containing their equal masses at 313 K .

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