Stoichiometry
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

The component molecules are non polar and are of almost equal size
The attractive forces between like and unlike molecules are almost equal
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
No component is concentrated at the surface of the solution

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Stoichiometry
Heat of reaction is not influenced by

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

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