Stoichiometry
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the

Nature of the gas
Total pressure
Temperature of the liquid
Nature of the liquid

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Stoichiometry
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

Obeys Raoult's law
Exhibits negative deviation from Raoult's law
Exhibits positive deviation from Raoult's law
May exhibit either positive or negative deviation from Raoult's law

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