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Not necessary to use as heat produced is already given in the question (11.4 kJ).

Moles of acid = Volume (in litres) molarity
= 0.2 1 = 0.2 mol

1 mol HCl 1 mol

0.2 mol HCl 0.2 mol

0.2 mol produced 11.4 kJ of heat

Heat produced by 1 mole = 57 kJ

Heat of neutralisation = - 57 kJ