Stoichiometry
Kopp's rule is helpful in finding the

Heat capacities of gases
Activation energy
Molal heat capacities of gases
Heat capacities of solids

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

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