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 liquid
Total pressure
Nature of the gas
Temperature of the liquid

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Stoichiometry
Heat of reaction is not influenced by

Whether the reaction is carried out at constant temperature or constant pressure
The route/method through which final products are obtained
The physical state (e.g., solid, liquid or gaseous) of reactants and products
None of these

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