What is the definition of standard enthalpy change of neutralisation, ΔH$_{neut}^\ominus$?
1 )
ΔH$_r^\ominus$ when one mole of an aqueous acid is neutralised by an aqueous alkali.
2 )
ΔH$_r^\ominus$ when one mole of an aqueous alkali is neutralised by an aqueous acid.
3 )
ΔH$_r^\ominus$ when one mole of an aqueous acid is neutralised by one mole of an aqueous alkali.
ΔH$_r^\ominus$ when an aqueous acid and an aqueous alkali react together to produce one mole of water.
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