Stoichiometry
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the

Boyle's law
Charle's law
Dalton's law of partial pressures
Avogadro's hypothesis

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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
0 < Xw < 0.5
Xw = 1.0
Xw = 0.5

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