ChemistryEnergy changesWAEC
50 cm³ of 1.0 mol/dm³ HCl is mixed with 50 cm³ of 1.0 mol/dm³ NaOH and 2.85 kJ of heat is released. Find the heat of neutralisation.
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Answer: D. −57 kJ/mol
0.05 mol of water forms; 2.85/0.05 = 57 kJ per mole, released, so ΔH = −57 kJ/mol.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.