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

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Stoichiometry
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

Vapor follows the ideal gas law
Molal latent heat of vaporisation is constant within the limited temperature range
All of these
Volume in the liquid state is negligible compared with that in the vapor state

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