Stoichiometry
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the

Dalton's law of partial pressures
Avogadro's hypothesis
Boyle's law
Charle's law

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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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