Stoichiometry
S.T.P. corresponds to

101.325 kPa gauge pressure & 15.5°C
1 atm. absolute pressure & 15.5°C
760 torr & 0°C
760 mm Hg gauge pressure & 15.5°C

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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 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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