Stoichiometry
Heat of reaction is not influenced by

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

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

The strong base and strong acid reacts completely
The salt formed does not hydrolyse
The strong base and strong acid reacts in aqueous solution
Only OH⁻ and H⁺ ions react in every case

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