Stoichiometry
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

Volume in the liquid state is negligible compared with that in the vapor state
All of these
Vapor follows the ideal gas law
Molal latent heat of vaporisation is constant within the limited temperature range

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Stoichiometry
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

0.5 < Xw < 1.0
Xw = 1.0
Xw = 0.5
0 < Xw < 0.5

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