Stoichiometry
Degrees of freedom will be equal to the number of components for a system comprising of

Two liquid components and one solute (soluble in both the liquids)
Only soluble liquid components
None of these
Partially miscible two liquid components system having two phases

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Stoichiometry
Heat of reaction is not influenced by

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

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